If they did the performance boost would be obvious with benchmark
testing.  The maximum sustained data transfer rate (read or write)
depends on how much data is stored on each "track" of data (1 revolution
of the platter with the head not moving) and the speed that the platter
is rotating.  All of the speed increases in the last few years have been
a result of the increased "bit-density" on the platters.  I have seen
one Seagate 1TB drive with suspiciously higher numbers than other
drives, but I don't know if that is due to a denser platter, or maybe
they are using 2 heads at a time.

Tom

-----Original Message-----
From: Steven M. Caesare [mailto:scaes...@caesare.com] 
Sent: Friday, September 18, 2009 9:09 AM
To: NT System Admin Issues
Subject: RE: Disk based backup

What makes you think they don't today?

-sc

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