stuartmcivor wrote on 2020-08-02, 07:20:
I am attempting to use a Compact Flash to IDE adapter in place of a typical hard drive but am running into an issue. It seems that when reading/writing from/to the card everything is really slow. The CF card(s) I have tried, all under 512MB, have been set up in the BIOS (Phoenix V1.00) with their correct CYL/HDS/SEC as detected by WHATIDE.COM and are recognized. I can delete/create partitions using FDISK.EXE and format using FORMAT.COM from DOS 6.22 without issue.
I found that it is not uncommon to have trouble getting some new drives on some early EIDE controllers. Seems like systems from the Late Socket 3 through Socket 7 know the lingo well enough to ask to top shelf LBA , but don't know enough to actually deal with the responses they get from ATA6/UDMA5. Curiously older systems (ISA/VLB) work fine with newer drives because they don't ask for more than they can handle.
I found I could get the (relatively) new drives to work in the old systems if the BIOS let me selected a drive mode in the last column of the Bios screen as "CHS" or "Normal" mode instead of "Auto", "Large" or "LBA". Then the motherboard doesn't ask for LBA and things go fine from there. CHS mode should alow you to use drives up to 128GB or so, depending on your bios or drive overlay.
https://www.vogonswiki.com/index.php/Storage# … compatibilities