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My Synology NAS shows the following S.M.A.R.T. data for my Western Digital WD20EADS-00S2B0: enter image description here

What is this Raw data value equal to 402 means? The current Value and Worst value looks OK. Should I be worried about hard drive health?

  • The Value and Worst scores go down as the drive deteriorates, so a value of 1 is as bad as it gets. The meaning of the Raw column will depend on the particular brand of hard drive. – James P Jan 6 '15 at 9:19
  • @James, thanks, I've added hard drive model to the question. – LA_ Jan 6 '15 at 9:28
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Could you run a test with WD Data Lifeguard Diagnostics and post a screenshot with the results? If you decide to go with an extended test backup your data first because if the software finds any errors, it will try to fix them automatically which can lead to a data loss.

You can download it from here: http://products.wdc.com/support/kb.ashx?id=mdiuuA

Let me know how it went. :)

  • I am afraid it is not possible. Or, is there any way to connect the hard drive to my Macbook Pro? ;) – LA_ Jan 6 '15 at 13:18
  • Unfortunately, Data Lifeguard isn't available for Mac systems. I just wanted to see if the manufacturer's tool will find the same results because those from the screenshot aren't good. Basically, the raw read error attribute value depends on read errors, disk surface condition and indicates the rate of hardware read errors that occurred when reading data from a disk surface. Lower values indicate that there is a problem with either disk surface or read/write heads and it can only grow in number, which is why so my advice here would be to backup the important data you have on the drive. – Mighty_Miro_WD Jan 6 '15 at 14:29

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