Reasons to cause uninitialized hard drive vary but basically fall into following types: Reasons for Internal/External Hard Drive Uninitialised on Mac This can be caused by different reasons, keep reading to find out how this come out. If there appears a message indicating uninitialized disk, it has 2 meanings:įor 1st time user of a brand new external hard drive, you will be required to initialize the disk for use, if your mac shows it as initialized external hard drive when connecting, it means your new external hard drive is not activated and not ready for use, your mac needs to use its own language to assign a starting value to the variable of this external hard drive.įor users who have initialized the hard drive before, uninitialized hard drive means your mac cannot read your disk anymore and deems this risk is not accessible, while this happens in most of the cases when talking about uninitialized hard drive.

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