very same question. Is the behavior you are describing above
manufacturer dependent or it is pretty much dictated by the general
design of modern drives?
the latter. the industry keyword is "Zone Bit Recording", which
simply tries to record data as densely as possible - determined
by linear spacing along a track. the only real question is how wide
the recording zone is: higher-end disks (usually scsi/fc and higher RPM)
emphasize low seek times, and thus narrow recording zones. that means
that they have relatively small difference between fast/outer and slow
tracks. mass-market disks optimize for density, so have a wide zone
which therefore has more decrease in bandwidth.
I have an array of 4 Maxtor sata drives, and
raw read performance at the end of the disk is 38mb/s compared to 62mb/s
at the beginning.
that's pretty typical.
regards, mark hahn.
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