Archived posting to the Leica Users Group, 2007/05/24

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Subject: [Leica] -Another-Question Re Backing Up to External Hard Drives
From: h_arche at yahoo.com (H. Ball Arche)
Date: Thu May 24 08:01:54 2007

I think you're right. I bought a similar 160 GB unit to use on the PC at 
school, and it has no such problems.
   
  So, basically I'll live with it. As Robert pointed out, they were CHEAP! 
With both units I got 660 GB of storage for $240.

Brian Reid <reid@mejac.palo-alto.ca.us> wrote:
  
> However, it does something on my G5 iMac I don't like;
> when the energy-saver puts the system to sleep, it
> reads the hard drive as having been improperly
> removed, the system wakes back up, won't go to sleep,
> and I keep getting the error message that a USB device
> has been improperly removed.

A USB hard drive has two separate mechanisms, usually designed and 
manufactured by different companies:
* The hard drive itself
* The USB interconnect enclosure.
The USB interconnect enclosure contains electronics that obey USB protocols, 
send commands to the disk, and send disk responses back to the computer. 
There is a fairly significant amount of electronics in this enclosure.

The situation that you describe is a failure of the enclosure electronics, 
either because it is designed wrong, because it is configured wrong, or 
because some part of it has failed. I just looked up your WDG1SU5000N drive 
on the Western Digital website, and it does not have any configuration 
switches or knobs or settings, so this is probably a design error in the 
enclosure electronics, probably because the designers focused on PCs instead 
of Macs.



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In reply to: Message from reid at mejac.palo-alto.ca.us (Brian Reid) ([Leica] -Another-Question Re Backing Up to External Hard Drives)