SCSI2SD V6 + PFSAIO + 32GB SD card: >4GB problem in PFSDoctor

[Yulquen74]

I've had an Acard + 32GBSSD DOM in my guru rom'ed A590 for years without trouble, but I wanted to test one of the SCSI2SD V6 cards I had,
as it would be a more neat solution, and I could find a better use for the
Acard adapter.



I started by updating it with the latest software, and adding a 64 GB Sandisk Ultra card. The card was setup with a single device, and the correct number of blocks in windows software + termination. Nothing special.


When powered up, HDToolbox (the 3.1.4 variant) recognizes the card,

and when setting up the card, the product of c/h/b is slightly less than

the actual number of blocks, so it should be ok.


I tried setting up only one partition, using PFSAIO, to slightly less than
the max possible size, for good measure.


When saving, rebooting and quick format is done, I always run a pfsdoctor
check to see if everything is ok, and to my surprise it is not.



It says it can not access >4GB area with either DS or TD64.


I get the same result if I try a Sandisk 32GB extreme pro micro SD card
in an adapter.


But: I also have an older Sony 16GB SD card, and when setting this up in
the same manner (15GB partition), no error messages occur with PFS Doctor, everything is good.


Previously I have set up a 32GB (non micro SD) Sandisk ultra SD card using SCSI2SD the same way in an A4000 with CS MK2 SCSI without any issues,
but I do not have any more such cards around at the moment to test.



Testing my problem cards in this A4000 gives the same result, so I can not
blame the A590 SCSI controller. Partition size below 4GB does not cause problems in PFSDoctor, but anything above does.



I did find an older V5 SDSI2SD adapter and tried the 32GB micro SD card
in it as well with the same result.


Any suggestions/help appreciated.

[Yulquen74]

It seems that for some reason the old pfsdoctor is unable to access >4GB of most of my larger Sandisk SD cards (now tested 16GB/32GB/64GB), but the experimental one by Toni Wilen does.



This behavior is the same on real Amiga via SCSI2SD, and using WinUAE via USB adapter, though on real Amiga TD64 is used, while on WinUAE NSD is used as access mode on experimental version.

[Kin Hell]

Can you try a different SD to Micro Adapter?

I have heard, all are not the same....

[Yulquen74]

I finally got the old PFS Doctor working.

I used a slightly different strategy when setting up the SD card in HDToolbox. Instead of using the drive geometry generated by HDToolbox when it read the drive definitions, which in my case for a 64GB card was 255 heads and 63 blocks per track (7.84MB/cylinder), I defined them manually. I used 32 heads and 32 blocks per cylinder (512KB/cylinder), giving me a granularity of exactly 0.5MB per cylinder when setting up partitions, which again I aligned to exact GB values. So something here did make a difference for PFS Doctor.