Check drive for errors Formatting errors can also cause a drive to be read-only. While in many cases formatting errors are relatively minor and tolerated by the system, there are times when the system may determine it safest to only mount the drive in a read-only state to prevent corruption to the data on it. When this happens, you should see a warning when attaching the drive that states it is only being mounted in read-only mode, and in these cases you should first back up all contents on the drive.
Then use Disk Utility or another robust disk or volume repair tool like DiskWarrior to check the drive for errors and attempt to fix them. Sometimes errors can go unnoticed on a drive, so if these tools report the drive is working OK, then consider wiping the drive and repartitioning it. This can be done with Disk Utility by selecting the drive device in the program's sidebar, then going to the Partition tab that appears and choosing "1 Partition" from the drop-down menu.
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Then click the Options button and choose GUID as the partition type to use, followed by clicking Apply to save these changes. Generally read-only errors with drives are limited to their formatting, so these steps should help fix the problem, but do keep an eye on the drive; if the problem crops up again, it could be a hardware malfunction in the drive, in which case it would be best to replace it.
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Solving read-only conditions for external hard drives
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In this situation, we should use Disk Utility to check the drive for errors and attempt to fix them. The following is the guidance to fix read-only external hard drive in Disk Utility:. If Disk Utility fails to repair the read-only external hard drive, we can try another repair tool like Diskwarrior. Store current Mac Data Recovery. Windows Data Recovery.
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