how to estimate the disk access time? e.g. the time between read one byte and

how to estimate the disk access time?
e.g. the time between read one byte and another byte in the
disk.

Question Posted / praveen

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how to estimate the disk access time? e.g. the time between read one byte and another byte in the ..

Answer / prasad jvv

Disks are block devices. Mean one block of data can be read
at one point of time. So there is no point of time between
read one byte and another byte. If intended to calculate
time to read one byte, first of all we need to calculate
the time required to read one block and devide that by
block size.

Access Time = Command Overhead Time + Seek Time + Settle
Time + Latency

This equation is not universal standard.

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how to estimate the disk access time? e.g. the time between read one byte and another byte in the ..

Answer / daniele

http://www.linuxinsight.com/how_fast_is_your_disk.html

% sudo hdparm -t /dev/hda

/dev/hda:
Timing buffered disk reads: 140 MB in 3.02 seconds = 46.28
MB/sec

Substitute /dev/hda with the name of your raw disk device,
of course (for example, it might be /dev/sda if you're using
libata, or something else).

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how to estimate the disk access time? e.g. the time between read one byte and another byte in the ..

Answer / arbit

I suppose the answer is to be figured out programmatically
not by handwaving. Every stupid in Computer Science knows
what you have answered

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3 No

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