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Benchmark Results: Throughput And Interface

3.5" Vs. 2.5" SAS HDDs: In Storage, Size Matters
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Seeing 115 to 196 MB/s sequential read throughput is pretty impressive. The 2.5” Ultrastar C15K147 is actually faster than the 450GB 3.5” Ultrastar generation. Although SSDs provide higher peak and average transfer rates, hard drives are still more reliable when it comes to delivering consistent performance at certain levels.


Our Iometer streaming read test confirms that the latest 15,000 RPM 2.5” drive is as fast as the last generation in 3.5” model.

Interface performance reflects the peak bandwidth when reading from or writing into the drive’s cache memory.

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  • 1 Hide
    lloydie_p , 9 May 2010 08:39
    "you can easily imagine that a simple RAID with four 3.5” drives could be replaced by six to ten 2.5” drives".

    With the drives mentioned at max throughput 10 x 2.5(15K) would draw 73 watts versus the 59 watts of the 4 x 3.5(15K 600GB) an considering the 4 x 3.5 would = 2.4TB of space and 10 x 2.5 only 1.4TB; unless no one considers capacity I don't see how 2.5 inch drives make for the best compromises.

  • 0 Hide
    andybird123 , 10 May 2010 23:34
    this article does talk about the trade off on throughput and performance per watt, versus raw capacity, but you are right, it's a trade off - at the same price point you can either go for 1.4TB of very fast storage space, or 2.4TB of fast storage

    if you were mainly interested in storage space you could get 4 x 1TB 7200rpm SAS drives for around the same price
  • 0 Hide
    shanky887614 , 10 August 2010 00:52
    this is not realy a valid test

    2.5inch drives where originally designed for laptops hence the small form factor and low power

    so it makes sence they will lose to speed and capacity of there 3.5 inch cosins
  • 0 Hide
    BulkZerker , 11 August 2010 23:53
    shanky887614this is not realy a valid test2.5inch drives where originally designed for laptops hence the small form factor and low power so it makes sence they will lose to speed and capacity of there 3.5 inch cosins


    Howso? Really the future for mass server storage seems to be migrating to 2.5" so it makes sense to see what the tradeoff is.

    Also, everyone who is reporting the spammers please mark them down as well as reporting them so people know they've been reported.