I've accessed the logs of these and I'm seeing: Got chunk 423 of 423įailed to verify InstallESD.dmg: hdiutil very failed On my new SSD the download progresses fine however the download of Mountain Lion is stuck in a loop of downloading additional components. The time machine backup is from this exact machine but a High Sierra OS and after a little googling there seemed to be the suggestion that a bootable OS had to be in place first. I wanted to do a direct time machine restore to the new drive right from disk utilities (which is downloaded) but this gave the error: An error occurred while adding a recovery system to the destination disk I have now purchased a new SSD (another Crucial but MX500). I assumed the issue was the SSD, it's only 2 and a half years old (it was a crucial upgrade and had been functioning absolutely fine). The error was: Reading on disk file failed, failing resume This just got itself into a loop of failing to download Mountain Lion after 17 hours. I then formatted the drive and tried to reinstall the OS. At this point I attempted a restore from time machine but this couldn't get past 0.1% after 24 hours for only around 100Gb of data, this led me to believe it was the SSD that has failed. When I opened disk utilities from macOS utilities the disk showed errors which couldn't be repaired. Have a mid 2012 Macbook pro that last week wasn't able to find the drive to boot from (just saw the folder with a question mark on booting).
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