USB drives dropping out

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USB drives dropping out

Post by grahamperrin » Thu Nov 22, 2012 11:46 pm

At viewtopic.php?p=3176#p3176 with a MacBook Pro running Mountain Lion:

zslg01 wrote:… may be related to either IO load on the USB drive or power. I have seen it most often when using Finder to copy a set of fairly large source folders (maybe 20 GB or so). The copy is to a 2.5 inch drive in one of those external enclosures. Have had it happen on both a Dynex enclosure and a Rocketfish one.

Could well be power related - the drives are powered by a USB hub using one of those 2-to-1 USB cables. Its usually 50% or so into a copy.
Never have had problems with Firewire.
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Re: USB drives dropping out

Post by grahamperrin » Fri Nov 23, 2012 12:13 am

Please, which model MacBook Pro? Any more details on the enclosures etc.?

No rush. But it's often useful to consider the hardware when puzzling over issues with devices on USB. viewtopic.php?p=3147#p3147 for a recent example.

----

Here: MacBookPro5,2 with 8 GB memory and a variety of USB drives, at least one of those drives nearly always used with an old-ish hub that has an independent power supply –

Sitecom USB 2.0 Dock CN-022:

  Product ID: 0x0022
  Vendor ID: 0x182d
  Version:  1.00
  Serial Number: 1111111
  Speed: Up to 480 Mb/sec
  Manufacturer: Sitecom CORP.
  Location ID: 0x26400000 / 3
  Current Available (mA): 500
  Current Required (mA): 0
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Re: USB drives dropping out

Post by zslg01 » Fri Nov 23, 2012 8:11 am

MacBookPro 8,2 16GB of memory I'll look at the drive types later today and post a followup.
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