Hitachi increases reliability with 3TB enterprise-class drive

By Jos
Jan 25, 2011
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  1. Hitachi has introduced a new member to its Ultrastar series of enterprise-class hard drives, one that the company claims will deliver greater reliability and save on energy costs at the same time. The Ultrastar 7K3000 is available in 2TB or 3TB variants featuring a 6.0 Gbps SATA or SAS (Serial Attached SCSI) interface. It comes with a 7,200RPM spindle speed, 64MB of cache and a power consumption of 5.6W or 6.6W while idling for the SATA or SAS versions, respectively.

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  2. 9Nails

    9Nails TechSpot Paladin Posts: 1,215   +177

    24 hours per day
    x 365 days per year
    = 8,760 hours in one year.

    2 Million hours is about 228 years. Call me a pessimist, but I doubt the actual MTBF numbers will hold true. I'm considering it lucky to get 5 years from a drive nestled lovingly in a rack with air and power conditioning.
  3. I agree with you completely.
  4. Rick

    Rick TechSpot Staff Posts: 4,572   +65

    You are correct if you're comparing small numbers of drives. MTBF numbers are almost entirely meaningless for consumers.

    An MTBF of 1,200,000 hours actually represents the total number of hours by a very, very large number of units, not just one or two. You need a VERY large sample size to come close to the MTBF.. like an enormous data center filled with them.

    A higher MTBF drive *should* indicate a more reliable drive, but it in NO way indicates how long ANY of those drives will last on their own.

    For example, if you have 50,000 of those hard drives in your data center, then you can reasonably expect one to fail every day (on average) (ie. 1,200,000 / 50,000 = average hours it takes for one of those drives to fail). If you have a million, then you you could reasonably assume you're going to have 1 bad hard drive every hour.

    If you have two in your PC though, they will not each last for 4400 hours. Manufacturers have no way of testing a drive until it dies (that process could take many years) so they just test thousands at a time to see how many fail. There is where the MTBF numbers come from.

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