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bobtomay

 
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Member Since: Dec 22, 2006
Location: Texas, where else?
Posts: 25,902
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Mac Specs: 15" MBP '06 2.33 C2D 4GB 10.7; 13" MBA '11 1.8 i7 4GB 10.10; 21" iMac '13 2.9 i5 8GB 10.10; 5s & 5c

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What you've already done is how to tell it's a bad drive - making a clone and running from there to compare speeds.

I've had multiple drives exhibit exactly the same symptoms over the years - thus far all were being used for Windows. The only ones under warranty I had do this were WD's 1st gen Green drives which all failed exactly in this way and even WD's own drive testing software would report the drive was ok. A single email to WD explaining the symptom was enough for WD to send me an overnight replacement drive - I had 3 of those all die the same death within a week to 2 months after purchase.

If you haven't, you could run Disk Repair, but I wouldn't trust a drive once it starts having bad blocks in multiple locations to cause this behavior.

I cannot be held responsible for the things that come out of my mouth.
In the Windows world, most everything folks don't understand is called a virus.
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