why won't my hard drive work on my mac it has been working previously although suddenly it come up with "cant read disk" i can see it in disk utility ?
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That's most likely because the drive is formatted in NTFS (Microsoft's proprietary file system), which Mac OS by default can only read, not write.
There are several ways to enable NTFS write support for Mac OS X.
The easiest and safest way to use an external drive with both Windows and Mac OS is to format the drive into exFAT (another Microsoft file system), which can be read and written to by Mac OS.