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HD Question

Discussion in 'General Hardware' started by bruinator, Mar 2, 2009.

  1. bruinator New Member

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    IF 2 hd were 500GB in size. One of them RPM's is listed as 7200 RPM 16MB Cache and the other is listed as 5400 to 7200 RPM 16MB Cache, would I even notice the difference in RPM? Please let me know. Here is a write up.

    http://www.techarp.com/showarticle.aspx?artno=532&pgno=0

    thx
     
  2. Hybrid_theory

    Hybrid_theory

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    It could be 7200, but it could be 5400. I'd say get another one that is 7200 cause yes the speed difference is noticeable.
     
  3. Fleck New Member

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    I thought only laptops still had 5400RPM options available. It's silly if companies are still making 5400RPM desktop drives.
     
  4. bruinator New Member

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    looking for more opinions plz. Thanks for those 2.
     
  5. AddSub

    AddSub

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    I believe you are referring to one of those variable spindle speed hard drive series like the entire Green Power line-up from Western Digital or a similar series from Hitachi. Difference I believe is that Western Digital's Green Power are actually in-variable spindle speed drives. That is, Western Digital puts either 5400RPM or 7200RPM motors into different Green Power drives, or revisions of those drives. So if you are buying a Green Power drive it really is like a lottery. You might get a 7200RPM version or you might not. Hitachi on the other hand puts actual motors into their drives that are capable of variable spindle speeds. Now, all this was true as of few months ago and Western Digital might have started putting actual motors capable of variable spindle speeds into their drives. Unknown factor really.

    Now would you notice the difference? Yes, especially if you do lot of disk intensive tasks. If all you do is browse the internet and play some random games then it really doesn't matter.
     
  6. D4S4

    D4S4

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    more RPM = lower latency - latency is very important factor in disk performance (lower = better)
     
  7. nafets New Member

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    WD's Green Power drives run at 5400RPM, period.

    No lottery, no variable speeds, etc.

    You'll never see WD state that in their HDD propaganda, because they don't want to scare off semi-knowledgeable buyers, with buying "old technology" 5400RPM drives. While it may spin slower, the WD Green Power's disk density is quite good, so sustained read/write performance isn't lacking (as much) when compared to current 7200RPM drives. Latency will always be a bit slower though...

    The only reason to get the WD Green Power drives is for a cheaper large capacity (>1TB) storage drive or for something that uses less power/runs cooler.

    If you're purely looking at performance, stick to a defined, current, high density (>320GB per) platter 7200RPM drive...
     
  8. bruinator New Member

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    Yes, I ended up going with Seagate Barracuda 500GB 7200RPM drive.

    thx all
     
  9. AddSub

    AddSub

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    In fact, there were 7200RPM Green Power drives. I would know, I owned one them. Although, I'm unsure what the situation is currently since they might have changed how they do things. Here is something from WD directly on their IntelliPower aspect of Green Power drives with relevant parts bolded:

    "IntelliPower - A fine-tuned balance of spin speed, transfer rate, and caching algorithms designed to deliver both significant power savings and solid performance. For each GreenPower drive model, WD may use a different, invariable RPM."

    Many reviewers pointed this out as well. Here is one from HotHardware regarding a 1TB GP drive.
    http://hothardware.com/Articles/Western_Digital_Caviar_and_RE2_GreenPower_1TB_Hard_Drives/

    As for Hitachi? With all their financial problems nowadays I can see them going the in-variable spindle speed route since it probably is the cheaper route to take.
     
  10. niko084

    niko084

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    The WD Green's are not very good drives... I have had a few fail quickly and the ones that do work are really dog slow.
     
  11. nafets New Member

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    As I said before, the supposed "Intellipower" feature is useless WD garbage marketspeak.

    How do you think the GP drives use less power than most other drives? Because it's always spinning slower. Less speed (in this case) means less power used.

    As far as knowing whether or not you got a 7200RPM version; It doesn't state the speed anywhere on the drive, nor is it easy to differentiate it based purely on sustained read/write performance or latency results.

    The only true way to find out is by doing a frequency analysis of the sound output of the the drive. You can read about that at SPCR, if you haven't already. I highly doubt you had some golden sample 7200RPM GreenPower drive (although weirder things have happened).

    The mention of a in-variable speed in Hitachi's power saving P7K500 series HDDs, was a misnomer. These drives run at a fixed 7200RPM speed, but save power by using slowed actuator movements, resulting in quieter seeks and lower power usage. The only problem with it is the very high latency (~18-19ms) and sub-standard IO performance.

    /WD GreenPower rant mode off
     

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