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The data will still be accessible from a PC. The issue is, Macs cannot read drives in NTFS format.
Which is what Windows uses.
If you connect the drive to a PC, you can pull all your files from it, then if you want the drive to work
on Mac, you need to format the drive in Mac OS extended journal format. That will erase all the files.
Which is why you must pull the files off first through a PC.
Once that is done, here are the steps to format the drive from your Mac:
If you need further assistance, let me know.
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