IBM DASD alternatives?

[jim stephens]

Sridhar Ayengar wrote:

machines such as the 9221 could have had older dasd on them from being
upgrades of 9370s.  I checked with a friend who I worked with in the 86 
to 90
timeframe, where we had a 9370-90, and it was upgraded to a 9221 to get
XA and ESA architechure, to allow OS debug. 

We had a 4381-91 with ESA but required some of the features on the 9221
to fully test what customers had.

The systems had 9335 as well as 9332 from earlier upgrades.  We ran either
VM or our own OS at the time, both on FBA.  We used CKD, but preformatted
it with fixed 4k sectors to essentially be an "FBA" type DASD, as we 
didnt do
keying.

for more on DASD, I found this site with lots of nice info:

http://www.sdisw.com/vm/dasd_capacity.html

Jim