Read only hard drive mac el capitan

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Partition a Drive with OS X El Capitan's Disk Utility

Info shows that the HDD is formatted in NTFS but, before upgrading, I was able to both read and write on the hard disk without any problem and without any external app. Any suggestions to solve this issue?

How it Works

Before I had other applications that are no longer valid for El Capitan. I think the issue may have to do with USB power. My portable drive without an external power source can not mount though it shows in system report and the light flashes.

Some Background

A drive with external power and the same formatting mounts without issue. Sign up to join this community.

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Disconnect the device from power. Physically disconnect one of the two drives from the device. Power the device on again. Repeat the diskutil checkraid command in Terminal as explained above. Repeat steps a-e if necessary to confirm which one is failed.

1. If Your Drive Is Blank

Power down the storage device. Physically remove the failed drive from the storage device. Once you have a new drive:. Physically insert the new drive into the available slot on the storage device.

Fixing Time Machine Errors - Backup Volume Is Read Only

Power the storage device on. A message may appear, asking to initialize the drive. Select Initialize. Type the following: diskutil list. A message will indicate that the adding process has begun. The rebuilding may require several hours to complete.

To facilitate the rebuilding: --Leave the storage device powered on for 24 consecutive hours. The figure below shows the rebuilding progress:. Once the rebuilding finishes, the checkraid tool will display the status of both disks as Online.