Cannot access external harddrive

I don't know if this is the right forum. I have copied 750Gb of data from my Macbook Pro to a partition on an external harddrive (WD MyBook). It is formatted as Mac OS extended (Journaled). After that I have used the partition as an airdisk to backup. Now when I connect it to my Macbook Pro USB port it gives me an error saying something like "the reference "xxx" could not be opened because the original item can not be found" (maybe not exactly like that because I'm on a danish Macbook.
I have checked for error on the hard disc using Drive Utility, but it reports no faults.
The same thing happened to me some weeks ago. Back then I reformatted my drive. But I hope there is a way that I can fix this without loosing my backup? Any suggestions? And what can do so this will not happen again? I would hate not to be able to back up my data.

jazztimedk wrote:
I don't know if this is the right forum. I have copied 750Gb of data from my Macbook Pro to a partition on an external harddrive (WD MyBook). It is formatted as Mac OS extended (Journaled).
Does it have either the GUID or APM *Partition Map Scheme?*
After that I have used the partition as an airdisk to backup.
With Time Machine? If so, the backups are in a +sparse bundle.+
Now when I connect it to my Macbook Pro USB port it gives me an error saying something like "the reference "xxx" could not be opened because the original item can not be found" (maybe not exactly like that because I'm on a danish Macbook.
I have checked for error on the hard disc using Drive Utility, but it reports no faults.
Try repairing the sparse bundle via Disk Utility.
The same thing happened to me some weeks ago. Back then I reformatted my drive. But I hope there is a way that I can fix this without loosing my backup? Any suggestions? And what can do so this will not happen again? I would hate not to be able to back up my data.
First, if you have both Time Machine backups and other data in the same partition, that's going to be a problem, sooner or later. See #3 in the Frequently Asked Questions *User Tip,* also at the top of this forum.
Second, Time Machine stores it's backups differently when they're done locally vs. over a network. Network backups are in a +sparse bundle;+ local ones are in a Backups.backupdb folder at the top level of the volume. Even if you're able to repair the sparse bundle, Time Machine may not continue backing-up to it. And you won't be able to see those backups normally, either. You'll have to manually mount the sparse bundle, then use the +*Browse ...+* option, per #17 in the FAQ Tip.

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