> Question - Are 73GB drives supposed to give better performance because
> of higher number of platters?

Not for your situation, no.   Your issue is random seek times for multiple 
simultaneous seek requests and batched checkpoint updates.   Things that help 
with this are:
More spindles
Better controllers, both RAID and individual disks
Faster drives

Particularly, I'd check out stuff like reports from Tom's Hardware for 
evaluating the real speed of drives and seek times.   Often a really good 
10000 RPM SCSI will beat a 15000RPM SCSI if the latter has poor onboard 

-Josh Berkus
 Aglio Database Solutions
 San Francisco

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