12 Feb
2003
12 Feb
'03
9:42 a.m.
If a drive does NOT have an asterisk, then it is
either a 1.2M, OR a 360K
from before the time that IBM realized that they needed to differentiate
and chose the wrong one to label, OR a 360K from most other manufacturers
other than those building drives for IBM.
According to the O&A TechRef, there are 2 distinct 40 cylinder drives :
The 'Slimline' drive used in the PortablePC and PCjr. This des not have
the asterisk
The double density (360K) drive for the PC/AT. This does have the asterisk.
They are difference electrically (made by difference companies?). I think
the use of pin 34 on the connector differs too. Officially you shouldn't
interchange them.
-tony