My USB 3.0 External HD is running faster than my Internal SATA III HD

RyanTScott · Oct 18, 2017

Just curious why this might be. Any thoughts? CrystalMark below:

Internal SATA III
Read:92MB/s, Write:88MB/s

External USB 3.0
Read:146MB/s, Write:145MB/s

Snipergod87 · Oct 18, 2017

What drives (models specifically)

RyanTScott · Oct 18, 2017

Internal HD:
https://www.newegg.com/Product/Product.aspx?Item=N82E16822136284

External HD:
https://www.newegg.com/Product/Product.aspx?item=N82E16822236807

Now that I did my own research the internal is apparently a SATA II not III. Care to guess how much faster a SATA III HDD would be in rw?

bskchaos · Oct 18, 2017

Note that HDDs are way faster at the beginning of the disk. Contrary to optical media, HDD start is at the outer edge of the disk. Just check the read/write performance of any spinning media.

This kind of test should be done on the whole disk while they are empty and not being used as a system drive.

Snipergod87 · Oct 18, 2017

0% faster if it was SATA 3 Your performance on your internal drive is within specs.
http://www.tomshardware.com/reviews/hitachi-western-digital-terabyte,2017-4.html

RyanTScott · Oct 18, 2017

The internal drive is SATA II. How much faster would SATA III be?

ArtPog · Oct 18, 2017

You do understand you're dealing with a internally-installed HDD that's over 10 (TEN) years old, yes? It will NEVER be "faster" no matter what "edge" it's "started" from. Try to spring for a SSD if your pocketbook can afford it.

Snipergod87 · Oct 18, 2017

RyanTScott :

Read above

RyanTScott · Oct 18, 2017

It's a fairly straightforward question. How much faster would a SATA III HD be?

Snipergod87 · Oct 18, 2017

As I said, answered above 0% (assuming the same 1TB capacity, but even if it wasn't still 0%) Its a pretty straight forward answer.

RyanTScott · Oct 18, 2017

I see I think I misunderstood your response. Are you saying that a SATA III drive would produce the same results as the SATA II above?

Snipergod87 · Oct 18, 2017

Correct, SATA II max speed is 300MB/s, no mechanical HDD can hit those speeds, so moving to a SATA III (600MB/s) interface would do nothing for a mechanical drive except for say accessing its very small (measured in Megabytes) cache.

RyanTScott · Oct 18, 2017

Ok thnx Sniper. Do you think you could explain why there is a difference in speed given that both HDs are mechanical? I ask becuase I assumed that the SATA drive was going to be faster...

Snipergod87 · Oct 18, 2017

That 1TB drive is 10 years old, its areal density (density of data on the disk) is much less than on that 4TB drive, one rotation of the drive will cover much less data than a modern 1TB drive. A modern 8TB 5400RPM drive will sit around 220MB/s of sequential performance on the outer tracks and 160ish on the inner tracks (assuming it is not an archive drive), although its random IOPs will suck compared to 7.2k RPM.

RyanTScott · Oct 18, 2017

Ok understood thanks for the info.

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