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Oct 2, 2016 12:31 PM in response to hart_ayr_97by Grant Bennet-Alder,★HelpfulPurgeable disk memory is disk memory that has files stored in it. The most frequent creator of these is "snapshot Backups" created when your regular backup drive is not available.
Purgeable means that they will be removed instantly if any other Application asks for file space that is not available otherwise.
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Oct 2, 2016 12:36 PM in response to Grant Bennet-Alderby hart_ayr_97,Is there anyway to turn off purgeable memory? I use an external hard drive to back up my macbook so I don't really need these snapshot backups.
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Oct 2, 2016 7:02 PM in response to hart_ayr_97by Grant Bennet-Alder,Time Machine makes automatic incremental Backups about hourly. It does so at such low priority, it barely disturbs what you are doing. If you do not regularly connect the Backup Drive, turning off these snapshots will leave you with no backups for the time you do not have the external drive connected. These files are not clogging up your drive -- as I said before, their space will be yielded instantly for new files if no other space is available, so these files are not "in your way". I do not recommend removing this safety net, just to have bigger numbers under "free space" on your drive.
If you are adamant about doing this, a quick search will bring up a Terminal procedure to turn off the local snapshot backups feature. Cut and paste the command from the article into Terminal.