OK, Now i'm getting Checksum errors

[Thomas]

My first thought was MaxTransfer but this seems correct already.

Could you please quote the complete error message.

If it mentions a block number, does the number vary between different tries or is it always the same?

As this is a SSD, do you have the opportunity to check for firmware updates? I remember that when SSDs became popular, the usual advice in computer magazines and support forums was to check for firmware updates first before you use the drive.

[Thomas]

I wonder if the difference in transfer rate between the UDMA-66 and PIO-4 specs
(66 MB/s vs 16.7 MB/s for PIO-4) means I should use a lower MaxTransfer.

Erm, MaxTransfer is chunk size, not transfer speed. Like MTU in networking. IDE can transfer max. 256 sectors at a time. That's 0x20000 bytes. 0x1fe00 is one sector less for safety.

The Amiga's IDE port does PIO-0 at most. UDMA specs don't matter at all and PIO-4 is far out of reach.