Go Back   MacRumors Forums > Apple Systems and Services > Mac Basics and Help

Reply
 
Thread Tools Search this Thread Display Modes
Old Apr 2, 2010, 11:32 AM   #1
Bennieboyİ
macrumors 65816
 
Bennieboyİ's Avatar
 
Join Date: Jan 2009
Location: england
Send a message via MSN to Bennieboyİ
Disk utility error : disk could not unmount

Hey guys, i'm trying to format a spare external, it's currently formatted to ms-dos for back up dutys on my PS3 but i want to change it to mac os extended

i've just plugged the drive in ( USB ), nothings running on it, or open on the computer from the drive, but disk utility wont erase it, i've checked permission and everythings fine but it just keeps giving me this error

google and apple fail, only thing i can find linked to it refers to operating systems running on the drive,
Attached Thumbnails
Click image for larger version

Name:	Picture 1.png
Views:	732
Size:	101.9 KB
ID:	220484  
__________________
Macrumors IRC: irc.krono.net room #macrumors download Colloquy or Adium
Search before you post: MRoogle
Bennieboyİ is offline   0 Reply With Quote
Old Apr 2, 2010, 09:55 PM   #2
BlueRevolution
macrumors 601
 
BlueRevolution's Avatar
 
Join Date: Jul 2004
Location: Montreal, QC
Usually this error means that some file on the partition is in use. Try relaunching Finder by control+option+clicking on the Finder icon in your Dock and selecting Relaunch. You can also try unmounting the partition manually by selecting it in Disk Utility and clicking Unmount in the toolbar.
__________________
PIRATE PARTY OF CANADA — Information leadership for the 21st century
BlueRevolution is offline   1 Reply With Quote
Old Apr 3, 2010, 05:00 AM   #3
Bennieboyİ
Thread Starter
macrumors 65816
 
Bennieboyİ's Avatar
 
Join Date: Jan 2009
Location: england
Send a message via MSN to Bennieboyİ
awesome blurevolution it worked a treat much thanks
__________________
Macrumors IRC: irc.krono.net room #macrumors download Colloquy or Adium
Search before you post: MRoogle
Bennieboyİ is offline   0 Reply With Quote
Old Aug 17, 2011, 09:28 PM   #4
tigerfan34
macrumors newbie
 
Join Date: Oct 2009
Quote:
Originally Posted by BlueRevolution View Post
Usually this error means that some file on the partition is in use. Try relaunching Finder by control+option+clicking on the Finder icon in your Dock and selecting Relaunch. You can also try unmounting the partition manually by selecting it in Disk Utility and clicking Unmount in the toolbar.
I'm having the same issue. I tried what you suggested and it didn't work. I'm trying to reformat a thumb drive (4gb). The drive won't allow me to delete anything off of it. I get the can't unmount message when I try to reformat. Any help would be great. Thanks.
tigerfan34 is offline   0 Reply With Quote
Old Oct 18, 2012, 09:47 PM   #5
Zwhaler
macrumors Demi-God
 
Zwhaler's Avatar
 
Join Date: Jun 2006
I'm having the same issue and relauching the Finder does not help. I can't find a whole lot of other resources on the web instructing me how to format this drive with this error message.
__________________
2x2.93 24GB 280X 25TB 2x1TB 840EVO 2xUAD OCTO, Apollo, 4-710d
Check Out My YouTube Channel~~~~~~~~~~~~~~~~~~~~~~~
Zwhaler is offline   0 Reply With Quote
Old Aug 14, 2013, 04:26 AM   #6
lagopede
macrumors newbie
 
Join Date: Oct 2011
This fixed the problem for me (Finder reset didn't work)

http://www.macappguide.com/2009/03/1...t-in-mac-os-x/
lagopede is offline   0 Reply With Quote

Reply
MacRumors Forums > Apple Systems and Services > Mac Basics and Help

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Similar Threads
thread Thread Starter Forum Replies Last Post
Error with Disk Utility Ressetas Mac Applications and Mac App Store 3 Aug 25, 2013 07:19 AM
need help understanding disk utility error harnadem OS X 10.8 Mountain Lion 8 Dec 6, 2012 12:58 PM
External disk repair can't unmount disk / disk still in use diskwarrior musio OS X 0 Aug 16, 2012 03:04 PM
Disk Utility error cannot be fixed bobfitz14 Mac OS X 10.7 Lion 3 Aug 1, 2012 12:24 PM
Trying to Restore iPod Classic and Get "Can't Unmount Disk" Error mBurns iPod 4 Jun 29, 2012 11:03 AM

Forum Jump

All times are GMT -5. The time now is 02:19 AM.

Mac Rumors | Mac | iPhone | iPhone Game Reviews | iPhone Apps

Mobile Version | Fixed | Fluid | Fluid HD
Copyright 2002-2013, MacRumors.com, LLC