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How should I re-format this for Mac 10.7.5 Do I use disc utilities FAT32 or is there some other format Not sure what Extended format is and if its suitable.

Also is it OK to erase all the present files on the disc Do I need a partition I have no obvious use for one.

To ReadWrite HFS from Windows, Install MacDrive To Read HFS (but not Write) from Windows, Install HFSExplorer.

It may look like a file, but thats just some trickery in the Finder--if you right-click it and do Show Package Contents (or look at the directory in Terminal), youll see what I mean.

That being said, its presented as such to prevent the average user from poking around inside the file.

If filefolder permissions are an issue, HFS is really the only file system supported on OS X that contains this feature.

In short, if youre only using it on Mac, go with HFS (a.k.a.

MacOS Extended). If you want to use it on Windows as well, consider a different format (see advantages and disadvantages another poster provided) or multiple partitions (as suggested by others, e.g., above).

If the data is important to you, MAKE A COPY A partition is especially useful if you want to use the drive for 2 purposes, such as having a section for TM backups and a section that allows you to write to it from both Windows and OS X.

Thats how I have my 2 GB WD My Passport drive set up, 1.5 GB for TM and the rest is in ExFAT for being able to write to it from Win 7 and OS X.

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Reformat My Wd Passport For Mac