USB compatibility
#13
Even with a real PC, there is no way to know what drive speed was used to record the original disk without using some mechanism to check it. What a FDC driver does for 5.25" disks is read a sector at one density and look for valid data. I have seen the driver put the drive into high density mode (360 RPMs) and try to read a sector number that is beyond what a low density disk would have. If it finds it, then its probably safe to assume it's not a low density disk. If it doesn't find it, then it switches to low density and tries checking valid sectors. This occurs only on a disk change, not on subsequent reads.

For a 3.5" disk/drive, the drivers rely strictly on the lack or presence of the HD hole (opposite of the write protect) to control the density.

SuperCard Pro gives you complete control of everything, just in case it is required. However, SOME drives will not change when told to, and are hardwired to act in certain ways. Most all of the 3.5" drives ignore any commands to change the density unless deliberately jumpered to have control (and only certain drives even have jumpers), and respond only to the HD hole being open or closed.
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Messages In This Thread
USB compatibility - by admin - 11-01-2013, 08:18 PM
RE: USB compatibility - by obo - 07-29-2014, 03:57 PM
RE: USB compatibility - by admin - 07-29-2014, 11:03 PM
RE: USB compatibility - by obo - 07-30-2014, 09:26 AM
RE: USB compatibility - by obo - 07-30-2014, 02:32 PM
RE: USB compatibility - by admin - 07-30-2014, 08:35 PM
RE: USB compatibility - by admin - 08-01-2014, 08:31 AM
RE: USB compatibility - by obo - 08-01-2014, 08:27 PM
RE: USB compatibility - by admin - 08-01-2014, 08:33 PM
RE: USB compatibility - by obo - 08-07-2014, 03:40 PM
RE: USB compatibility - by admin - 08-07-2014, 10:59 PM
RE: USB compatibility - by obo - 08-11-2014, 02:26 PM
RE: USB compatibility - by admin - 08-11-2014, 04:10 PM
RE: USB compatibility - by obo - 08-12-2014, 01:02 PM
RE: USB compatibility - by admin - 08-12-2014, 06:43 PM
RE: USB compatibility - by admin - 09-04-2014, 07:24 AM
RE: USB compatibility - by obo - 09-05-2014, 05:27 PM
RE: USB compatibility - by admin - 09-05-2014, 06:58 PM



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