HDD GURU FORUMS

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.

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

Wrong chip config?

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.

Once more, if you have half page empty, just use DDR=on. It should help.

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

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.

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

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.