I've got an Optiarc 7260s, flashed with Liggy's 1.03bt firmware.
In XP, discs read fine and I scanned one and it was fairly good at 94%.
In Win7, the same disc causes Explorer to freeze and the drive head can be heard constantly struggling to read the disc. The contents are visible but clicking on a folder doesn't open it, or at least not for ages, so something about Win7 is making the drive act wierd.
I've gathered some driver info from both XP and Win7 and attached it below. I have tried disabling Daemon Tools' SPTD driver and also uninstalling and reinstalling the 7260, neither of which has helped.
There's also a load of Event ID: 51 warnings in the log which say "An error was detected on device \Device\CdRom0 during a paging operation."
Drivers - cdrom.sys, imapi.sys, redbook.sys, storprop.dll
DTlite - 4.35.6.0091 SPTD v1.62 (only SCSI drive)
Standard Dual Channel PCI IDE Controller: atapi.sys, pciide.sys, pciidex.sys
AMD SMBus Driver for South Bridge v5.10.1000.8 installed
Drivers - cdrom.sys
DTPro v4.41.0314.0232 SPTD v1.78 (SPTD disabled)
Standard Dual Channel PCI IDE Controller: atapi.sys, ataport.sys, pciide.sys, pciidex.sys
Filter Driver Load Order - ImgBurn v126.96.36.199
Upper Device Filter: [None Found]
Upper Class Filter: [None Found]
Device: CD/DVD-ROM Device
Lower Class Filter: [None Found]
Lower Device Filter: [None Found]