I am using Mac OS X 10.6.4.

I partitioned an external USB drive to Mac OS Extended (Journaled) using Disk Utility. One partition contains a backup of my Mac's hard drive.  A second partition contains data files. I then attached the drive to the Pogoplug and went online with it.  I use the Pogoplug application to mount the drives on my desktop.

I can copy files to the data partition.  I can duplicate files in the data partition.  I can delete files in the data partition.

Here is the problem:  I cannot copy files to the backup partition, nor duplicate files in the backup partition, nor delete files in the backup partition.  The backup partition is acting like a read only drive.

When I attempt to copy a file to the backup partition or duplicate a files, I get a Finder dialog box that has my Mac administrator account name is automatically entered, and a request for my password.

Once I enter my password, the copy fails with the following error message: One or more items can’t be copied to “Organize” because you don’t have permission to read them. Do you want to copy the items you are allowed to read?

When I press O.K., nothing happens.

More seriously:  If I attempt to copy files to the backup drive repeatedly, eventually, the Mac OS X Finder crashes and cannot be relaunched.  This forced me to restart the Mac.

When I attempt to copy files via the Safari web browser to the backup partition, the copy fails. Copying to the data partition is fine.

This is a serious stability issue with Pogoplug.  Is it a problem with partitioning drives?

Note that I have to force eject the "Files shared with me" partition that Pogoplug creates.  It says one or more programs may be using it - despite nothing on my end using it.

Is anyone having the same problem?