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Hard Drive - Seek Time, Write Time, and Latency - Looking for clarification

These are the Seek Time, Write Time, and Latency specs for my old hard drive (Seagate Momentus 7200.4 ST9500420ASG 500GB 7200 RPM).

Average Seek Time = 11ms
Average Write Time = 13ms
Average Latency = 4.17ms

What's the total Read Time? Here's my guess:
Average Total Read Time = Average Seek Time + Average Latency
Is this correct?

What's the total Write Time? Here's my guess:
Average Write Time = Average Write Time  + Average Latency
Is this correct? Or, do I omit Latency because it's already included in the Average Write Time?
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jdana
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jdana
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2 Solutions
 
Duncan MeyersCommented:
Yes - latency is typically one half of a rotation. Total read time should include settling time and the time to read a sector. Your calculation for write time is correct assuming that the specs have included seek time in the write time. If not, you need to add average seek time.

It's quite a slow drive. A 10k enterprise drive has latency around 3.5mS and average seek times around 2.5mS.
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jdanaAuthor Commented:
Thanks!
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Duncan MeyersCommented:
Thanks! Glad I could help.
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