The initial encryption bar in the tray icon stops at a certain percentage and remains at this position. There will also be an entry in the security.log. This indicates that a bad sector has been found.
We do not recommend installing the product if there are bad sectors on your hard disk.
Known to apply to the following Sophos product(s) and version(s)
Sophos SafeGuard Disk Encryption for Mac, 5.50.0
MAC OS 10.5.x and 10.6.x
What to do
We recommend decrypting the drive, uninstalling the software, replacing the hard drive and installing again.
As of SafeGuard Disk Encryption for Mac 5.50.1 the initial encryption does not stop when bad sectors are encountered, but a log entry is created in the kernel log. But we recommend that you do not install the product if there are bad sectors on your hard disk.