can't get Mac to recognize MyBook

Solution
Depending on the OS (Windows 7 or Mac OS X) the drive could be formatted using exFAT and that will allow the drive to be used on either a Mac or PC and will allow for transfer or files larger than 4GB.

byza

Honorable
You might need to reformat it. Go into the disk utility and see if it shows up there, then you will need to erase the disk and choose a format type. If you want to use the drive with Windows as well you'll need to format it as Fat32, although you won't be able to load files larger than 4gb without special software, or if you will only use it on mac use OSX extended as it will be much faster.