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Apple Computing Products:
macOS - Operating System
External Hard Drive Mounting Problem
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<blockquote data-quote="MacInWin" data-source="post: 1826372" data-attributes="member: 396914"><p>Paul, I have a theory on what may have happened. No science, but a theory. I had a drive a while ago that had been a TM backup. I wanted, like you, to reuse the drive so I attached it. It didn't appear. However, I have a dual-screen setup and keep Activity Monitor on one screen so I can see what is going on and I could see a lot of disk activity. I also saw some CPU activity but I don't remember the process name. So I knew something was going on. I let it run for a while and eventually it mounted, the backups were fully visible and the disk activity stopped. So what I think may be happening is that because it was a TM drive, and because the OS knows when a drive is a TM drive (the icon changes, for example), it might have been doing an integrity check on not just the drive, but also the backup. And integrity checking on a TM backup can take a long time because every chain of links needs to be tested. So that's my theory for what happened to you--the drive was being integrity checked AND the TM backup was being integrity checked as well.</p><p></p><p>In any event, glad you got it sorted.</p><p></p><p>EDIT: And by the way, subsequent mounts of that drive, even with the TM Backup still there, worked well. TM must somehow mark or store the metadata on the backup to know when it needs to do a full check. (Also theory, I have no evidence that it does that other than the observation of what happened to me.)</p></blockquote><p></p>
[QUOTE="MacInWin, post: 1826372, member: 396914"] Paul, I have a theory on what may have happened. No science, but a theory. I had a drive a while ago that had been a TM backup. I wanted, like you, to reuse the drive so I attached it. It didn't appear. However, I have a dual-screen setup and keep Activity Monitor on one screen so I can see what is going on and I could see a lot of disk activity. I also saw some CPU activity but I don't remember the process name. So I knew something was going on. I let it run for a while and eventually it mounted, the backups were fully visible and the disk activity stopped. So what I think may be happening is that because it was a TM drive, and because the OS knows when a drive is a TM drive (the icon changes, for example), it might have been doing an integrity check on not just the drive, but also the backup. And integrity checking on a TM backup can take a long time because every chain of links needs to be tested. So that's my theory for what happened to you--the drive was being integrity checked AND the TM backup was being integrity checked as well. In any event, glad you got it sorted. EDIT: And by the way, subsequent mounts of that drive, even with the TM Backup still there, worked well. TM must somehow mark or store the metadata on the backup to know when it needs to do a full check. (Also theory, I have no evidence that it does that other than the observation of what happened to me.) [/QUOTE]
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Apple Computing Products:
macOS - Operating System
External Hard Drive Mounting Problem
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