Okay. Size shouldn't be problem then, and as your asr-x recognzes the cardreader, I don't think SCSI ID is issue here.
You could try formatting disk with you computer. Or even take a step further and create following folders on disk: BANKS, SEQUENCE, SESSION, SOUNDS and WAVES. So total of 5 folders, all capital letters on folder names. Those 5 folders are created whenever you save something on disk, so maybe asr would think that disk is formatted, even thought it is not.
It's been a while since I formatted my disks for asr-x, and I don't remember all the steps I took too well.
