Check rpm of external disk drive

how can i check the rpm of my external disk drive. I have a Seagate FreeAgent GoFlex 2TB Desk.
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  1. I quess you want cake with your Ice cream also.

    There are programs to measure the performance, ie benchmarks such as Crystaldiskmark, As SSD, and a couple of others.. But there is NO software that truely measures the RPMs - reason Manuf provided no output.
  2. Because it is a modern drive in an external case, you can assume that it is running slower than 7200 rpm.
  3. Best answer
    Most drives report their RPM via the ATA Identify Device command. Either of the following utilities should tell you.

    HD Sentinel (DOS / Windows / Linux):

    HDDScan for Windows:

    Alternatively, you can actually "measure" the RPM by examining HD Tune's access time graph:
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