Hi Ronni, I tried a couple of the things you suggested but kept getting a message that the disk could not be unmounted and so the Repair Disk could not be done.
So I decided that erasing and reformatting the disk was the only option, but again it was not possible as it could not unmount the disk. Following a previous post of yours about deleting, I have not tried to delete by dragging the backups to the Trash. What's next?? Regards, Peter Bull iMac 10.6.6 Windows 7 (also under sufferance!) On 07/02/2011, at 7:36 PM, Ronda Brown wrote: > > > On 07/02/2011, at 6:48 PM, Peter Bull wrote: > >> >> I have an external hard drive for backups and I think there is a problem >> with a backup of a USB drive. I tried to delete so I could do another backup >> but I get an error message -50 which the Apple website translates as "-50 >> paramErr Error in user parameter list". >> >> Time Machine also informs me that it can't do its hourly backup. >> >> Any ideas? > > Hi Peter, > > How did you try to delete the backup? You should never delete Time Machine > backups by moving them to the Trash with Finder. > They should only be deleted by using the Time Machine backup itself (enter > Time Machine, select the backup, click the gear button, select "delete > backup”. > > Otherwise our TM backups will corrupted. If they are you would need to > reformat your Time Machine disk with Disk Utility and start over. > > But first: Try to “Repair the Backup Time Machine Drive > <http://web.me.com/pondini/Time_Machine/A5.html> > > Time Machine won’t be able to do it’s hourly backup until you can repair the > File System on the drive. > > > Cheers, > Ronni > > 17" MacBook Pro Intel Core i7 > 2.66GHz / 8GB / 1067 MHz DDR3 / 500GB Serial ATA Drive @ 7200rpm > > OS X 10.6.6 Snow Leopard > Windows 7 Ultimate (under sufferance) > > > > > > > > > > > > -- The WA Macintosh User Group Mailing List -- > Archives - <http://www.wamug.org.au/mailinglist/archives.shtml> > Guidelines - <http://www.wamug.org.au/mailinglist/guidelines.shtml> > Unsubscribe - <mailto:wamug-unsubscr...@wamug.org.au> > Regards, Peter Bull pb...@bbnet.com.au -- The WA Macintosh User Group Mailing List -- Archives - <http://www.wamug.org.au/mailinglist/archives.shtml> Guidelines - <http://www.wamug.org.au/mailinglist/guidelines.shtml> Unsubscribe - <mailto:wamug-unsubscr...@wamug.org.au>
