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If you cannot transfer a data/file from your Mac to your external hard drive it may be because the external hard drive is formatted in a NTFS file system which is used for a Windows PC only. If it has a NFTS file system then only a Mac / Apple computer can read it but cannot write to it.
Therefore if you want to move files between a Mac & Windows and vice versa you need a file system that works for them of them (fat32 or expat).
Important Note: Remember when you format a drive you are basically deleting everything on that drive!
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