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EDIT: My original intent with this question was to figure out if it would be worth purchasing a 7200rpm drive if mine turns out to be 5400rpm, but Giacomo1968 has made it clear that RPM alone is not significant to the overall performance.

However, I’m still intrigued with all the conflicting information and would like a definite way to confirm which speed my drive rotates at. Could you run the HD Tune test yourself, if you have a 7200rpm drive, and post the results below?

I’ve got a Samsung HD103SI/SRA under Windows 7.

There’s no info regarding RPM on the sticker, and searching the model number online has yielded conflicting results, featuring both 5400 and 7200 for the same model number.

HD Tune has produced this result, which would made you think my disk is actualy 5400 rpm according to the 5th post, by GeneO, on SevenForums.

https://i.stack.imgur.com/vfH1x.jpg

The vertical width of the yellow dots roughly equals to 11ms which, according to him, is the latency for a 5400 drive (opposed to 8ms, which would be the one for 7200). I didn’t find other screenshots to compare, though. Would any commenters here post their own results with a confirmed 7200rpm drive?

However, SiSoftware Sandra reports it as being 7200, but I’m not sure where it got this value from. Comments below and around the web says the software pulls this from a database, but I’m not sure if I can trust them on this specific case.

enter image description here

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    SiSoftware Sandra works off a database.
    – Ramhound
    Apr 2, 2015 at 11:07
  • Maybe there is something similar to WesternDigital's "IntelliPower" at work here. In WD's HDDs that means that different drives of the same model can have different rotational speeds that lie somewhere between 7200 and 5400rpm. (Note, that the speed of each actual drive is fixed)
    – Slizzered
    Apr 2, 2015 at 13:20
  • @Ramhound Interesting. I'm not so sure if we can trust it in this case, though, considering all the conflicting information.
    – André Carini
    Apr 3, 2015 at 16:06
  • @Slizzered I've heard this was a common practice for WD HDDs. Analyzing again the HD Tune graph, maybe this is what is going on with my drive. At certain moments, the vertical width approximates 11ms, and at other moments, it's closer to 8ms. If any of you have a confirmed 7200rpm drive, could you run the HD Tune tests too please?
    – André Carini
    Apr 3, 2015 at 16:06
  • @JakeGould Question is about a similar subject, but I couldn't find an answer to identify whether a drive runs at 5400 or 7200rpm, only determine read/write speeds (which is not what I'm interested in).
    – André Carini
    Apr 3, 2015 at 16:10

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