Guide to Replacing the NG4 Navidrive 3D Hard Drive with a CF Card

This unit is the NG4 system, made by Harman Becker.
Main Features: DVD, Voice Commands, HighRes Display, 3D Mapping, Bluetooth Hands Free, Independent Phone with MDS Module, SD Card, USB, Jukebox.

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Guide to Replacing the NG4 Navidrive 3D Hard Drive with a CF Card

Post by GiveMeABreak » 28 Mar 2017, 13:57

A post from a member who has likely suffered a Hard Drive failure on his NG4 Navidrive 3D system has prompted me to re-double my efforts in finding a possible pre-emptive solution to Drive Failure. The same can be said of the RT4 system with a HDD, although these units seem to have more issues than the NG4. Although the principle is the same for both systems, the procedures are different for restoring the disk images. This article is focussed on the NG4 system specifically.
Possible Solutions:
  • Pay about 570 Euros to have it sent off for repair.
  • Attempt to source a replacement PATA drive that meets the original hard drive’s automotive specifications (almost impossible).
  • Clone the working hard drive and replace it with a Compact Flash card, whilst preserving the original Hard Drive and Disk Image.
I was unable to locate a new replacement drive of the same specification. Although there were general PATA drives available on the Web, they did not meet the higher operating automotive specifications required and the vast majority were used or ‘refurbished’ if there is such a thing, so there is no guarantee they are any better than your existing original drive and I would not recommend using one.

A little Background
The NG4 system is made by Harman Becker Automotive and is powered by the QNX RTOS (Real-Time Operating System) developed by QNX Software Systems. QNX were founded in 1980 and are based in Ottawa, Ontario. They were acquired by Harman International in 2004, but RIM (Research In Motion), those behind Blackberry Phones, reached a deal in 2010 with Harman to acquire QNX.

QNX is used in many automotive systems and is the software that runs car digital dashboards, ADAS , Infotainment, Telematics, etc., and is used by Audi, BMW, Ford, Jaguar, Land Rover, Maserati, Porsche and PSA amongst others.

The Original NG4 Hard Drive
As you would expect, the Hard Drive has to be able to operate under extreme tolerances of altitude, humidity, shock, vibration and temperature. It is a specialist drive, generally exceeding laptop drive specifications. The drive is manufactured by Toshiba and the model is either an MK4036GAC or MK4050GAC, the latter supporting ATA-7.
MK4036GAC Original NG4 HDD
MK4036GAC-Original-NG4-HDD.png (130.78 KiB) Viewed 4827 times
The MK4036GAC drive has a 40GB capacity and supports the ATA-2 to ATA-6 PATA IDE interface, with a spin speed of 4,200 RPM and can withstand tolerances of temperature between -40 to +85 degrees C and operate at -30 to +85 degrees C.

For those interested, detailed specifications on the Hard Drive can be found here:
Toshiba MK4036GAC HDD Specification Sheet

So despite this high level of reliability, like all drives they still have a finite life and will wear out at some point or may develop a problem where they can’t boot.

These systems were a near £2k option, so are not cheap and it is near impossible to get an identical new replacement hard drive on the retail market today. I’ve yet to find a specialist repairer in the UK for these specific units, although I believe the Clarion Service Centre has now added some of the Harmon Becker units to their list.

Faced with these extreme costs to repair or replace, and given that the Head Unit interfaces with many of the car’s systems, it is not practical to replace the head unit with an after-market double DIN unit, which will probably cost as much as a repair and won’t have the operational functionality of the current system.

My Preferred Solution
One possible solution was to look at backing up and replacing the Hard Drive while it is still in good working order and not exhibiting any errors. My drive is already 7 years old, so I decided now is a good time to make a duplicate. The problem is that although QNX is an extremely fast and reliable OS, there is very little you can do to recover any data using conventional Windows based systems as the file system is completely different. Also, you don’t really want Windows to be messing about with your drive and writing ‘System Volume Information’ files or any other data to your drive, as that will corrupt it for sure. (Why Microsoft ever forced the unnecessary writing of these files to removable media on the public with no way of permanently preventing this is on later Windows 10 systems is an ongoing issue, but that’s another story).

Choice of Replacement Drive
One point to remember is that the system was developed years before it came into production in 2008, with the later SATA 3.0 specification drives being produced about the same time the NG4 was already in service throughout the PSA group.

The most important thing about this system is primarily the read speed, as it needs to be able to read-in and process the mapping data as fast as possible. The only real write operations are when you save a location or an address book / phone entry, or when you copy music to the Hard Drive to use with the Jukebox function and of course, update the firmware or map versions.

Solid State Drives (SSDs)
I tried a PATA SSD drive previously (an SSD with an IDE interface), but this failed miserably. The system got stuck in a loop and would not work at all.

There have been those that have tried an SSD, but many find it works for a while, then the whole system starts to slow down and grind to a halt. Delays in navigation processing, route calculation, system reboots, freezing and other odd behaviour have all been exhibited when using an SSD.

Apart from compatibility, this may also be due to the drive running out of free data blocks to write data to. Without OS level TRIM support, the system slows down as a result of the intense delete/ re-write cycles that occur. As SSDs only work with whole data blocks, in order to write any data, the SSD has to first erase the whole block and any existing data held within it, then re-write the whole block again with the new data. These additional data writes slows down the system, causing delays and extra wear, reducing the life expectancy of the drive. The TRIM function can work with the actual data pages that are contained within the data blocks, so saves unnecessary writes. Additionally, with an OS that supports TRIM, the OS sends a TRIM command to the SSD controller when specific data is redundant or no longer required. TRIM can then erase this data area in advance of the OS needing the space and so speed things up considerably.

So SSDs would be great, except that it seems the TRIM function isn’t supported by the 6.3.0 version of the QNX RTOS used in this system and does need to be supported by the both the OS and the hardware to work. Although most controllers will have some form of internal controller to undertake wear levelling across the drive, it is a much slower system than having native file support.

Compact Flash (CF)
One possible solution is to use a CF (Compact Flash) card.

Compact Flash is a removable mass storage device that electrically complies with the PCMCIA (Personal Computer Memory Card International Association) ATA standard, and supports True IDE mode, being electrically compatible with an IDE disk drive. Compact Flash cards support both +5V and +3.3V operation and can function at either voltage level. Compact Flash uses the standard ATA registers and command set, and has automatic error correction, retry capabilities and error correction code.

Apart from the obvious advantages of using flash memory storage and having no moving parts, they consume much less power. Typically, CF cards use a single watt of power, compared to 20-30W for 2.5” and 3.5” HDDs, so should generate far less heat inside the unit. Heat is another issue for electronics. Although the NG4 has a built in fan with a larger volume of air to circulate being a double DIN unit, having less heat to dissipate will be an advantage. It has been known for the fan to stop working, causing overheating problems, so may be worth checking if proceeding with the drive replacement.
UDMA 6 64GB Compact Flash Card
Komputerbay-64-GB-CF.png (65.54 KiB) Viewed 4827 times
There aren’t any 40 GB sized CF cards on the market, so the nearest was a 64 GB version. You will have to lose the extra 20 GB, as the partitions must be identical to the original drive. Trying to increase the partitions (for example to try and increase the 10 GB partition dedicated to music storage) will not work as the partitions are expected to be a certain size by the OS.

When selecting a Compact Flash card, I recommend that you ensure it is UDMA 6 as some people have had issues with UDMA 7 cards not writing data properly when trying to copy the image back or later during system operation. This may be down to the firmware on your card reader though - so I would stick with a UDMA 6 and 600x speed at least. Considering that the original drive supported was ATA 6 (100 MB/s) this will do fine as UDMA 6 supports up to 133 MB/s. I used a UDMA 6 CF 600x Card with min 90MB/second sequential read and Min 60MB/second sequential write. Link here:
CF Card Link

There are also many reports on the Web that many SanDisk and SanDisk Extreme cards are very ‘twitchy’ and have a reputation for not working in many devices including Dash Cameras and Digital Cameras. The CF card linked to above is about £29 as of writing, so is a cost effective alternative.

Compact Flash to IDE Adapter
You will need a CF to IDE adapter that can be bought very cheaply. For our purposes, we would need a CF to IDE 2.5” 44 Pin adapter, not the 40 pin type that are designed for the 3.5” Desktop versions. Pins 41 to 44 carry the 5V power supply that would normally be supplied by a Molex connector in a desktop version. The one pictured below happens to be a dual CF card adapter. I only bought this one instead of a single adapter because I mistakenly assumed from the pictures that this one had a metal bracket with screw holes that would allow it to be mounted in the NG4 HDD tray enclosure (there are additional holes along the sides of the metal support too). It didn’t! The screw holes are completely wrongly spaced when compared to the mounting screws on a 2.5” drive, but it still does the job.
IDE-Adapter-B.png (141.1 KiB) Viewed 1823 times
HDD Cloning Software
Cloning the Hard Drive will allow you to keep an image of the drive in its current state, so that you will always have a working image if your hard drive starts to fail in the future. Obviously if your system is already exhibiting data errors related to the Hard Drive, these will also be copied over.

Choosing the software to make a copy of the HDD is also important, some do not work very well. I have tried Acronis, Clonezilla and Paragon, and these failed to create a usable copy in my case (probably too many options). So my solution in the end was to use the free Open Source HDD Raw Copy Tool, from HDD Guru, which worked flawlessly, has a simple and easy interface with no complex options and is available from here:
HDD Guru Open Source Software

With the HDD Raw Copy tool can make an exact duplicate of a SATA, IDE, SAS, SCSI or SSD hard disk drive regardless of the Operating or file system on the HDD. It will also work with any USB and FIREWIRE external drive enclosures as well as SD, MMC, MemoryStick and CompactFlash media. The tool is free for home use.

This software will create a compressed image of an exact duplicate of the entire drive, sector by sector, so all the partitions and data will be replicated.

IDE to USB Card Reader
You will need some form of USB to IDE converter in order to copy the data from the original Hard Drive to an image file and again to write the image back to the CF Card.
USB to IDE Converter
I already had one of these from Startech that are reasonably priced. They are available in USB 2.0 or 3.0 specifications - but be advised that my USB 3.0 version failed to write back to the CF Card when connected directly to the IDE adapter and when connected to the USB 3.0 Port. In the end, I used the Compact Flash Internal PC Card Reader I have and this worked fine, albeit at a sustained 2.8MB/s write speed. I was happy with this as at least the data was copied back correctly without incident.

This is probably down to the USB 3.0 speeds being too fast for the CF card to handle as you have to remember that the USB 3.0 SATA / IDE converter is designed to send through data at the fastest speed available and also that the CF IDE Adapter is passive. It should be fine with USB 2.0 though.

In order to get inside the NG4, you will have to remove it from the vehicle - normally if replacing just the Hard Drive, this would be accessed from the left hand side where there is an access flap secured by a single screw and the drive will slide out on a runner. In this case we can’t work through the small gap as the CF to IDE adapter will need to be carefully secured and supported.

1) First thing is to disconnect the battery (follow BSI reset procedure for battery removal / connection) as the unit can will remain powered on even with the ignition off.
2) Ensure either 6th gear on a manual or the shift selector on an Auto is as far back as possible to allow room for the unit to be extracted.
3) Use four of these DIN removal keys and insert them with the curved edge facing inwards towards the NG4 unit. They will click into place. Partially ease the unit out to allow enough room to get your hand in through the back to allow access to the connectors:
DIN Removal Keys.png
DIN Removal Keys
DIN Removal Keys.png (22.14 KiB) Viewed 4827 times
4) Remove the connectors
A word of caution. It is very important that the LVDS screen connector at the rear of the unit arrowed in yellow in the picture below is not disconnected when the unit is powered, as this can cause failure of the multifunction screen! This is a Citroen documented warning.
  • Always remove the 40 way Quad Lock connector (the large black one) first as this carries the power. It has a swing over locking mechanism that must be moved gently and this will release the connector.
  • The same locking mechanism applies to the pale blue connector above.
  • The LVDS connector can be carefully wiggled out and has no other securing latch.
  • The GPS / GSM and Aerial Antennae arrowed in red, are locked in place by a small plastic lug at the top. Use a small flat blade screwdriver to gently press down on this while gently pulling the connector away.
  • The USB and other connectors should be easily removable.
NG4 Rear Connectors.png
NG4 Rear Connectors
5) Carefully slide the unit out, supporting the weight at the rear as it is quite heavy!

Back at your workbench:
6) Next, you need to remove the 4 torx screws on the top of the unit indicated with green arrows.
7) The whole of the top of the unit is basically loosely hinged at the rear (connector end). You must be extremely careful here, as immediately attached to the inside of the lid is the DVD player and the ribbon cables, so do not go poking about inside with any instrument.
8) Using a small flat bladed screwdriver or blunt instrument, you need to gently lift the top of the unit working from the front of the sides, working towards the back on each side. Use a gentle pressure to lift the unit lid up, but do not use too much force as it may suddenly release and you may pull or damage the ribbon cables.
NG4 DVD Unit and Lid hinged Open
NG4-DVD-Unit-and-Lid-hinged-Open.png (102.41 KiB) Viewed 4827 times
9) Be aware that the unit is not secured at the hinge - it can easily lift off so be extremely careful not to leave the unit unsupported as there is a lot of weight on the top of the lid. Also be very careful not to put any strain on the ribbon connector.
10) Undo the small torx screw on the left hand side, and use a small flat blade screwdriver to lower the metal flap. You can now slide the hard drive enclosure out of the unit.
11) Remove the 4 screws securing the drive to the enclosure - be aware that there is some ‘thread lock’ type adhesive on these - so they will be quite tight - also make sure that your torx bit is the right size to prevent damage to the head.
12) Gently lower the Lid back down and put the NG4 unit safely to one side.
Connect your Hard Drive to your IDE to USB converter first before powering up the converter (if applicable) and then connect the converter to your USB port.
14) Launch HDD Guru, which should detect all the PC Hard Drives as well as the NG4 Toshiba. You can check the correct drive by looking at the Serial Number on the HDD and matching this with the serial number shown in HDD Guru.
15) You first select the Toshiba as the source drive from the list, then you select the target location. In this case as we want to keep a source image of the drive, so select a target location on one of you PC Hard Drives that has at least 40GB free space. The tool makes a compressed image of the drive which in this case will result in roughly 24GB on completion.
16) Once the image has been copied and there are no errors reported, you can prepare to copy the image back over to the CF Card.
If using an IDE to USB converter:
17) If the CF to IDE adapter card has any jumper settings to configure, ensure the CF card is configured as ‘Slave’, as the NG4’s DVD Drive is the ‘Master’.
18) Ensure the USB connection of your IDE to USB converter device is removed from the PC. Insert the CF card into the CF to IDE adapter and in turn, connect the adapter to the IDE to USB converter device. Ensure that the pins are lined up properly then connect to the USB 2.0 port of your PC.
Pin Connector
Pin-Connector.png (64.89 KiB) Viewed 4827 times
If using an Internal PC Card Reader:
17) Insert your CF card directly into the CF slot of your internal PC Card reader
18) Open up HDD Guru and this time select the ‘File’ - in the case below ‘IMAGE of TOSHIBA MK4036GAC’ Image that you created earlier as the Source and select the CF card as the Target (Drive M: in my case).
HDD Guru.png
HDD Guru
19) Select ‘Continue’ and leave the drive to copy - it will take longer to write than it took to copy. As I used the Internal Card Reader is only wrote back at 2.8MB/s, so will take an hour or so minimum.
Copying Back Image to CF Card Using HDD Guru
Copying-Back-Image-to-CF-Card-Using-HDD-Guru.png (78.93 KiB) Viewed 4827 times
20) Once completed and assuming there were no errors, power off and remove the CF Card Adapter or eject the CF Card from the Reader.
21) Depending on the type of CF to IDE adapter you have, you may need to support it once it is plugged into the NG4’s PATA connector. Although these adapter cards are quite light, you do not want any vibration bouncing the card up and down, weakening the pins. Also, depending on your adapter, you must not allow any part of the underside of the pins or solder joints to come into contact with the drive enclosure metal. I used some ‘coin’ type adhesive foam pads and positioned a few of these under the card to act as both a cushion and an insulator. These worked great in keeping the adapter card level.

This picture shows one of the foam pads in place - I used 2 in all.
Placing Several Coin Pads to Cushion IDE Converter
Placing-Several-Coin-Pads-to-Cushion-IDE-Converter.png (75.42 KiB) Viewed 4827 times
NG4 DVD Unit and Lid hinged Open
NG4-DVD-Unit-and-Lid-hinged-Open.png (102.41 KiB) Viewed 4827 times
Placing a Foam 'Coin Pad' under the CF Adapter
Placing-a-Foam-'Coin-Pad'-under-the-CF-Adapter.png (105.93 KiB) Viewed 4827 times
22) Now carefully position the CF Card adapter into position and connect the pins ensuring they line up correctly. Check that there is no excess play and that the adapter is well supported.
CF Card and IDE Adapter Installed
CF-Card-and-IDE-Adapter-Installed.png (99.83 KiB) Viewed 4827 times
23) Secure the drive bay rail flap and replace the screw. Carefully close the lid ensuring you don’t trap the ribbon cable. I would suggest securing with one screw, just to keep the lid shut, until you connect the unit back up and check the system, in case you need to remove it again.
24) Re-connect the cables at the rear, ensuring that you connect the 40 pin Quad lock connector last. Gently slide the unit in, but don’t lock the unit back into place until it has been tested. Follow the battery connection procedure.
25) Start the engine and wait for Navidrive to initialise - it may take a little while after switching on for the first time after the replacement. Go through all the screens and check the functionality.
26) If you have any issues with the system playing up. Just ensure you have the latest firmware available on a USB key and insert this into the USB port in the central armrest. Version N42C (42.03) is the latest available, PM me if you require this. On insertion the system should pick this up and offer to update the system. It will take about 30 minutes or less, but keep the engine running, so the car doesn’t go into economy mode.
27) If all is well, you can then replace the remaining 3 screws and lock the unit back into place. Calculating a route is a lot quicker and the boot time should be noticeable shorter too.

So keep your original NG4 Hard Drive somewhere safe, sealed up in an anti-static bag. You now have the NG4 disk image stored on your PC in compressed format, so keep that safe and you can always copy the image to a new CF card in the future if needed.

This is the solution I chose to implement on my own system and have been using it now for some time without any problems to date.

The usual disclaimer applies here - should you decide to follow this guide, you do so of your own choice and at your own risk and neither myself, nor the French Car Forum Admin Team will be held responsible for any damage to persons, vehicles or equipment, howsoever caused, as a result.

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Re: Guide to Replacing the NG4 Navidrive 3D Hard Drive with a CF Card

Post by FranklinJ » 15 May 2017, 12:53

Ok, found the reply button - simple when you look!!

A rather important question for me, having entered deeply into preparing an NG4 installation and not having had the opportunity yet of trying out the head unit, is the Nav software N42c. Does this update solve the historic 7 character post code deficiency and if not are there any signs that such an upgrade will be available?

Since post code navigation is relatively easy and accurate I guess, without it, its a question of road names or pin pointing from the map!?

Any responses welcome.

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Re: Guide to Replacing the NG4 Navidrive 3D Hard Drive with a CF Card

Post by FranklinJ » 15 May 2017, 13:07

Does software update N42c for NG4 3D solve the 7 character post code problem and if not, is there any sign of a patch coming up?

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Re: Guide to Replacing the NG4 Navidrive 3D Hard Drive with a CF Card

Post by GiveMeABreak » 15 May 2017, 13:08

Hi Julian, this is the latest update (as of posting) of the firmware for this system and it does not resolve the 7 digit post code mapping. There is unlikely to be an update to resolve this.
The 5 digit on this system works reasonably well. Entering the 5 digits via voice or manually will list all the addresses for the postcode, so you can pick the street if there are more than one.. The system will of course allow GPS coordinates to be input in addition if that is required. I think they key is planning - if you know where you will be going - try entering it into the system prior to the journey to see if the address is exact enough for you, then if you need to fine tune it, you can always get the GPS coordinates from google before travelling. :)

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Re: Guide to Replacing the NG4 Navidrive 3D Hard Drive with a CF Card

Post by GiveMeABreak » 15 May 2017, 13:11

It really depends on the address - 80% of the time in my case, it asks if I want to input a street or house number, or you can pick from the list. You also can go into map mode, use the jog wheel to locate the exact position on the map you want to go, zoom in and then select to navigate there as another option.

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Re: Guide to Replacing the NG4 Navidrive 3D Hard Drive with a CF Card

Post by pokra » 13 Feb 2018, 12:13

hi, where to buy din removal keys? thank you

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Re: Guide to Replacing the NG4 Navidrive 3D Hard Drive with a CF Card

Post by GiveMeABreak » 13 Feb 2018, 12:29

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Re: Guide to Replacing the NG4 Navidrive 3D Hard Drive with a CF Card

Post by mrhardware » 12 Aug 2018, 20:45

Has Anyone tried a 1.8" drive from an ipod ?.
The Spec's look similar if not better than the original drive

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Re: Guide to Replacing the NG4 Navidrive 3D Hard Drive with a CF Card

Post by GiveMeABreak » 12 Aug 2018, 21:30

You would have to get a LIF to PATA / IDE interface converter, and they would have to be UDMA6, as UDMA7 or any later and they won’t work. Could be an alternative to try, but I’ve had no issues with a CF card that I’ve been using for 3 years now.

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Re: Guide to Replacing the NG4 Navidrive 3D Hard Drive with a CF Card

Post by EJC5 » 04 Sep 2018, 21:07

Hello Marc,

thank you for you're layout of the replacement of the hard disk.

Does this mean you've found the solution for the spontainious reboot problem ?

regards Ernst Jan

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Re: Guide to Replacing the NG4 Navidrive 3D Hard Drive with a CF Card

Post by GiveMeABreak » 04 Sep 2018, 21:49

Hi Ernst. I think I can say that since I’ve done the modification, it has only restarted about 4 times in total. So yes I am pleased I did it. The boot time is a lot quicker and so is the route calculation. It hasn’t restarted for over a year so I think for me it was worth doing without a doubt.

Of course I have my original hard drive stored safely away, but so far everything is great.

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Re: Guide to Replacing the NG4 Navidrive 3D Hard Drive with a CF Card

Post by EJC5 » 04 Sep 2018, 21:57

Thanks, I m going to try it👍

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Re: Guide to Replacing the NG4 Navidrive 3D Hard Drive with a CF Card

Post by nico06 » 28 Nov 2018, 17:03

Hello, many thanks for this wonderful guide. I did replace my drive yesterday using it and ... no reboot so far !!!

Great job there ! My 2 cents, if you want to use waze on your smartphone instead of the outdated cartography of the NG4, go with an app called "AudioBT Plus", it will read on the car stereo all notifications from your phone (direction from waze but could be also sms or mail or whatever). It force the phone to use the bluetooth voice protocol instead of bluetooth AD2P, so the sound is no HQ don't expect to play music. I can share my config in another post if somebody is interested.

I have no other interest than sharing my experience and extend a bit the usage of this NG4 audio system.

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Re: Guide to Replacing the NG4 Navidrive 3D Hard Drive with a CF Card

Post by GiveMeABreak » 28 Nov 2018, 17:09

Hi Nico and welcome.

Thanks for posting that update, I really hope it helps you - I have been using mine for a good few years now with no problems at all - boot speed for me is a lot faster. I still don't use the Jukebox function (my preference) as I rely on the SD card for that. But what you have said there is very interesting about Waze.

As you probably know, we have been left stranded by PSA as they are no longer requesting HERE maps to provide any further updates on the MyWay or NG4 (and other systems) now past the 2016-2 update - which is the last one. So that may well be a solution. Thanks for posting.

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Re: Guide to Replacing the NG4 Navidrive 3D Hard Drive with a CF Card

Post by jroqueca » 03 Jan 2019, 18:22

Hi all.

Very good work!

I wish I had seen it before. Now is late. The hard drive of my NG4 died. Does anyone know or can you tell me where I could find an image of the hard drive to be able to restore my system?
I would be grateful.