There are plenty of projects on the net which add IDE drives
to various on-topic machines. Often these projects will not work
with drives bigger that ~500MB (or sometimes ~2GB). So small
drives can be useful sometimes.
Various on-topic machines have limits on the size of drive
with which they will work. For example, the VAXstation 3100s
are (usually) limited to 1.073GB system drives (at least for
OpenVMS).
Antonio