File transfer speed - Partition to partition

[churin]

I measured time to transfer 1048MB file between partitions in a same
physical drive. It took about 6.66 seconds. The physical dirve is
SATA-150 and CPUs are Opteron 244x2(1.8GHz). The machine is about 4
years old. Is this speed normal?

 

[smlunatick]

I measured time to transfer 1048MB file between partitions in a same
physical drive. It took about 6.66 seconds. The physical dirve is
SATA-150 and CPUs are Opteron 244x2(1.8GHz). The machine is about 4
years old. Is this speed normal?

I have not timed any transfers between partitions but with the
knowledge that the two partitions are on the same drive, I would
consider that this is the normal speeds. You must know that most hard
drives have only one set of read/write heads. Since both partitions
are on the same drive, the head must move between partitions and
change between read / write modes. There will always be be some
delay when moving the head and changing modes.

 

[churin]

I have not timed any transfers between partitions but with the
knowledge that the two partitions are on the same drive, I would
consider that this is the normal speeds. You must know that most hard
drives have only one set of read/write heads. Since both partitions
are on the same drive, the head must move between partitions and
change between read / write modes. There will always be be some
delay when moving the head and changing modes.

Thanks for your response.
I have just come to realize that the measured time was incorrectly
stated in my OP. It was 18.55 seconds instead of 6.66 seconds.
This makes about 56.5 MBype/s. This is lot less than maximum speed of
150 MBype/s SATA-150 allows. Is this because of the reason you described?

 

[Plato]

I measured time to transfer 1048MB file between partitions in a same
physical drive. It took about 6.66 seconds. The physical dirve is
SATA-150 and CPUs are Opteron 244x2(1.8GHz). The machine is about 4
years old. Is this speed normal?

Every PC is different.

 

[AlmostBob]

56.5mb read Plus
56.5mb written Plus
thrash time moving the heads around, what more do you want
drive speeds are like car fuel, manufacturers report has nothing to do with
reality


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[M.I.5¾]

Thanks for your response.
I have just come to realize that the measured time was incorrectly stated
in my OP. It was 18.55 seconds instead of 6.66 seconds.
This makes about 56.5 MBype/s. This is lot less than maximum speed of 150
MBype/s SATA-150 allows. Is this because of the reason you described?

150 Mbytes/sec is the maximum sustained burst data rate over the SATA bus.
The speed is indeed slowed by the drive having to shift the read/write heads
around, and by having to wait for the target sector to come around one it
has done so (plus several other factors that are unlikely to become clear in
this post).

 

[Unknown]

Took far too long. Even 6.66 seconds is far too long.