Acomdata EXTERNAL E5 HARD DRIVE USB 2.0 User Manual page 75

When I upgraded from Mac OS 9 to Mac OS X, my computer
asked me to re-initialize the Drive.
A: If this message appears, you have no choice but to re-initialize
the Drive in order to use it on Mac OS X. Using another comput-
er if necessary, copy the data stored on your Drive to a second
hard drive or other storage device. Re-initialize the AcomData
Drive on Mac OS X, and then copy the data from the second
storage device back to the AcomData Drive.
Why is my Drive asking me to initialize it? It was already for-
matted and it contains data.
A: On Mac OS 9, you may need to initialize a hard drive the first
time you connect it to your computer, even though the hard
drive may have already been formatted. Another reason is that
the file system might have become corrupted, in which case it
needs to be repaired. Use disk utility software to repair the disk.
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