This seems to have been getting worse lately, and now it’s gotten so I can’t use two of my WD external hard drives. My Mac is a late 2013 MBP running Big Sur, 11.2.1 with 16 GB RAM and an internal 512 GB SSD.
Both backup drives are 1 TB drives, a few years old. Maybe more than a few years. Newer than my MBP though.
One is being used for a Time Machine drive, and the other split into two volumes (1) for a CCC (Carbon Copy Cloner) cloned daily backup and (2) a smaller partition for BackBlaze cloud backups because there wasn’t enough space on my internal drive for the miscellaneous space it needed to process files.
Lately both Time Machine and CCC backups were often not completing. I could restart and then get backups again for a few days but it seemed unreliable.
Right now I can’t get backups with either.
I decided to use an SD card for the BackBlaze extra partition since this Mac has an internal SD slot and I wasn’t using this SD card for anything else. So I reformatted the SD card and that’s fine. Backblaze is up-to-date.
Since I didn’t need the extra CCC drive partition for Backblaze, I wanted to erase the entire drive and start over again clean. But even in recovery mode I can’t mount everything on that drive, so I can’t erase it.
I wanted to start clean with the Time Machine drive also, but I can’t mount it or erase it now either.
It’s possible that both drives have gone bad, but it seems like a coincidence for them both to go bad at the same time.
It’s not the hub, because I have an external SSD connected to it with my large Photos library on it and it’s working fine.
It’s not one or the other WD drives interfering with the other because I tried just mounting one at a time and leaving the other disconnected. That doesn’t work either. And I tried different hub slots.
Right now my backup situation is that Backblaze is working and up to date, so I can restore from there as needed. And I have full iCloud service, including Desktop and Documents.
I plan on updating my MBP later in the year, so I went ahead and ordered a new 2 TB external hard drive which should arrive tomorrow. I’ll try formatting that and using it for CCC. My newer Mac will need a larger capacity drive anyway. If that works I’ll maybe get another drive for Time Machine.
But can anybody think of anything else I can try?