IBM did make several drives in 2.5" that works with XTA or ATA
interface.
Listed here for 2.5"
WDA-240/280 40mb/80mb
WDA-S260 - 60mb and WDA-2120 120mb.
The XTA and ATA is selected by one pin on the 44pin interface and
it's there on the ibm website.
http://www.storage.ibm.com/techsup/hddtech/table.htm
Jason D.
email: jpero(a)cgocable.net
Pero, Jason D.