hard disk in HP test equipment

Hello,

I have bought a HP test equipment build with a hard disk inside.

The test equipment is a logic analysis system HP 16500C designed in the
nineties: DOS, 540 Mb hard disk, 16 Mb system RAM,...

The original hard disk is a 540AT made by Quantum, and is referenced
with a HP part number.

I try to replace the hard disk because it is out of order, with a "new"
6.1 Gb disk, formatted with a FAT16 partition and a final 2.1 Gb capacity.

The HP system does not recognize the hard disk and I can't go further.

Any idea on what is wrong and things I can do to fix the problem ?


thank you