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Windows 7: unable to 'safely eject' my new external drive.

02 Jun 2012   #11
alphanumeric

Windows 10 Education 64 bit
 
 

The standard USB 2 port is limited to 500ma per port. If the external drive requires more than that it will often come with power pack, a second USB power cable, or the main cable will have two USB plugs on it. One power and DATA and one power only. My laptop drive enclosure came with the two cables. If I don't plug the power only cable in before the DATA and power cable the drive doesn't get detected properly and or acts erratic.


My System SpecsSystem Spec
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02 Jun 2012   #12
lehnerus2000

W7 Ultimate SP1, LM18.3 MATE, W10 Home, #All 64 bit
 
 

Quote   Quote: Originally Posted by TVeblen View Post
My best guess is that it is due to poorly written software that starts a service or process and then does not release it or shut it down when you close the program. The system thinks the drive is still active because the process/service is still running.
According to "Process Explorer" the offending process is usually Windows Explorer (on my PC anyway).
My System SpecsSystem Spec
02 Jun 2012   #13
TVeblen

Microsoft Community Contributor Award Recipient

Windows 7 64 Bit Home Premium SP1
 
 

Just to be sure we are not giving out confusing information:
The USB standard is 500900 mA @ 5v .
DC of course.

Universal Serial Bus - Wikipedia, the free encyclopedia


Attached Images
unable to 'safely eject' my new external drive.-usb-2.png unable to 'safely eject' my new external drive.-usb-3.png 
My System SpecsSystem Spec
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02 Jun 2012   #14
Lykho

Windows 7 Home Premium 32bit
 
 

Quote   Quote: Originally Posted by TVeblen View Post
So the problem is solved?
unless it happens again, it looks like this was probably the cause.
probably fair to mark it as solved since it probably has nothing to do with Windows 7
My System SpecsSystem Spec
02 Jun 2012   #15
alphanumeric

Windows 10 Education 64 bit
 
 

I stand corrected, the old standard was 500ma. There are some high powered ports that will give out more. Still, I think you'll find that most external drives are designed with the 500ma limit in mind. The higher current output is a good thing if you're recharging a phone or MP3 player though. Technology marches on.
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 unable to 'safely eject' my new external drive.




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