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Compact Flash Sandisk 64 GB
http://forum.hddguru.com/viewtopic.php?f=10&t=42242		 Page 1 of 1
Author:  Yuri2015 [ March 16th, 2022, 11:44 ]
Post subject:  Compact Flash Sandisk 64 GB
Hello everyone, i'm looking for some advices. We have a CF Sandisk Extreme UDMA 7 64 GB and we are working it with VNR.It has a Sandisk 20-82-00549 G835G38W25 controller and two memory chips BGA 132. The matter here is that, in the dump, we can read one half of each memory and the other half is empty. Either we can't find ECC or valid Xor. We don´t think that it could be a bad read of the memory but we are not sure if this controllers work in that way. If someone had the same "problem" with this kind of CF we are looking for help. Thanks to all.

Best Regards.

Attachments:
File comment: This is the partial view of the dump.
HDDGuru.jpg
HDDGuru.jpg [ 349.38 KiB | Viewed 9789 times ]
Author:  Arch Stanton [ March 17th, 2022, 7:32 ]
Post subject:  Re: Compact Flash Sandisk 64 GB
I don't have VNR, but is this a situation where you need to turn chip 180 degrees and read again? See https://forum.hddguru.com/viewtopic.php ... le=desktop
Author:  melvin [ March 17th, 2022, 9:36 ]
Post subject:  Re: Compact Flash Sandisk 64 GB
Wrong chip config?
Author:  arvika [ March 17th, 2022, 13:33 ]
Post subject:  Re: Compact Flash Sandisk 64 GB
This cases use join by page 0x8 (8bytes). As I remember ECC is after joining, so you need find correct order. XOR is usually standard, two or three different for this controller.
Author:  arvika [ March 18th, 2022, 17:14 ]
Post subject:  Re: Compact Flash Sandisk 64 GB
Once more, if you have half page empty, just use DDR=on. It should help.
Author:  Amarbir[CDR-Labs] [ March 18th, 2022, 21:39 ]
Post subject:  Re: Compact Flash Sandisk 64 GB
Yuri2015 wrote:
Hello everyone, i'm looking for some advices. We have a CF Sandisk Extreme UDMA 7 64 GB and we are working it with VNR.It has a Sandisk 20-82-00549 G835G38W25 controller and two memory chips BGA 132. The matter here is that, in the dump, we can read one half of each memory and the other half is empty. Either we can't find ECC or valid Xor. We don´t think that it could be a bad read of the memory but we are not sure if this controllers work in that way. If someone had the same "problem" with this kind of CF we are looking for help. Thanks to all.

Best Regards.


Hello ,
Ho many crystals in it i hope 2 ,If thats true turn BGA 132 chip 360 degree and read again other two crystals will be there ,Its a pain to recover these with VNR the support guys i wonder what they keep doing in PC3K its like 123 and its done
Author:  Yuri2015 [ March 23rd, 2022, 15:54 ]
Post subject:  Re: Compact Flash Sandisk 64 GB
Thanks to all for your helpness. I read it ok in 4 separated "boxes" (on VNR), but i'm still searching for the correct XoR. So here we go again ;). If i don't find it i will ask to the Rusolut Support. Thanks again.

Best Regards.
Author:  Amarbir[CDR-Labs] [ March 24th, 2022, 3:30 ]
Post subject:  Re: Compact Flash Sandisk 64 GB
Yuri2015 wrote:
Thanks to all for your helpness. I read it ok in 4 separated "boxes" (on VNR), but i'm still searching for the correct XoR. So here we go again ;). If i don't find it i will ask to the Rusolut Support. Thanks again.

Best Regards.


Hi ,
Could you share photos of the Device and The internal PCB ,It will be interesting to see and give you our experience in recovery of these
Author:  Yuri2015 [ April 1st, 2022, 15:58 ]
Post subject:  Re: Compact Flash Sandisk 64 GB
Hi Amarbir, so sorry for the delay in my response. Days after my last post the customer decided to cancel the recovery work. So i can't send the pics. Hope the next time can help to this community. thanks to all again.
Best Regards.
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