Some IDE flash adapters miss the 44th pin (IDE type), so they not work on Amiga. 40 pin versions simply not work at all.
I have a Toshiba (IBM/Mac relabeled) 2Gb 2.5" hard drive on my ks37300 A600. Some bad implemented IDE drives simply don't work (yes, scsi.device resident on ks37300 is bad-written).
Assuming you have a 37300 (2.05 ROM), try different hd's in order to see if one is recognized.
