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MtnBiker Author

Level 1

103 points

TimeMachine failure: Files can’t be copied onto the backup disk because it is read-only

TimeMachine error "Files can’t be copied onto the backup disk because it is read-only. You may need to repair or erase the disk using Disk Utility. If the disk can’t be repaired, select a different disk for backups."

Disk is locally mounted via USB. I've repaired it twice with no errors. I have permissions to read and write. Seagate Model SRD0NF2. Mac OS Extended (Journaled). 1.2TB available. First backup was nine months ago according to the date on the earlier backup; there are 68 other dated folders.

Suspect a bug. High Sierra. Just noticed Info option and says writeable. Time for bug report.

From DiskUtilities info:

Volume name : Seagate 8TB Backup

Volume type : Physical Volume

BSD device node : disk4s2

Mount point : /Volumes/Seagate 8TB Backup

File system : Mac OS Extended (Journaled)

Connection : USB

Device tree path : IODeviceTree:/PCI0@0/XHC1@14

Writable : Yes

Is case-sensitive : No

File system UUID : 06D99680-CCBB-38DC-AEBF-88BEF038ED4A

Volume capacity : 6,560,301,293,568

Available space (Purgeable + Free) : 1,223,529,309,797

Purgeable space : 4,183,369,317

Free space : 1,219,345,940,480

iMac, OS X 10.11

Posted on Mar 12, 2020 5:25 PM

Top-ranking reply

BDAqua

Level 10

245,231 points

Posted on Mar 12, 2020 7:08 PM

Some very good suggestions here...

https://discussions.apple.com/thread/6689621?answerId=30447685022#30447685022

https://www.datanumen.com/blogs/4-solutions-backup-volume-read-error-using-time-machine-mac/

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TimeMachine failure: Files can’t be copied onto the backup disk because it is read-only

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