How many 1" hard drives can you fit in an ordinary computer bay?

[Randall Hofland]

In regards to the thought of creating a powerful RAID system that fits 
into an ordinary 3.5 or 5.25" bay (or external USB/Firewire box), I 
spotted this article about Hitachi 1" Microdrive (4GB) hard drives on 
Yahoo this morning:

http://story.news.yahoo.com/news?tmpl=story&cid=569&ncid=738&e=1&u=/nm/20040517/tc_nm/tech_hitachi_drives_dc

" Hitachi GST said that the Thailand Board of Investment had approved 
the expansion of the plant's capacity to 60 million units annually from 
30 million. In addition to the Microdrive, Hitachi GST's 2.4-inch 
Travelstar drives used in laptops and its 3.5-inch Deskstar drives used 
in desktop PCs and personal video recorders are made at the Thailand plant."