Mid 2009 Model A1278 / 2.26 or 2.53 GHz Core 2 Duo processor EMC 2326

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Disk removed from MacBook in external case is read only; Why?

Replaced the internal HDD with a Samsung SSD and placed the put one in a USB 3 to SATA external box. The disk is now read only

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See what About This Mac > More Info... > System Report tells you about the disks format. Look at:

  • Partition Map Type it should be GPT (GUID Partition Table)
  • File System would be Journaled HFS
  • Lastly look just below File System for Writable what does it tell you?

You may need to reformat the drive.

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