Now when looking at disk utility, and select 'show all devices', the above is the internal HHD, currently not being used, formatted as mac os extended journaled, but for the external, formatted in APFS, it has the intermediate 'container disk2'. a long time and with the intro of High Sierra SSDs were migrated to a newer format called APFS.
#FORMAT AN EXTERNAL SSD DRIVE FOR MAC HIGH SIERRA HOW TO#
Secure erase options are available only for some types of storage devices. Here is how to mount an external hard drive on Mac: 1. (Optional) If available, click Security Options, use the slider to choose how many times to write over the erased data, then click OK. APFS is not officially supported for macOS versions prior to 10.13 (High Sierra), and will not mount on 10.12 and earlier. How to format your drive APFS on macOS 11 (Big Sur) and later. i formatted it as APFS (think it's recommended for SSDs) and installed OS. Click the Format pop-up menu, then choose a file system format. External Drives Ultra Touch Family One Touch Family Expansion BarraCuda Fast SSD Backup Plus Basic Photo Drive Backup Plus Hub. High Sierra works fine on external drives and internal drives, but Boot Camp, Time Machine, and FileVault are potential problems: APFS with Time Machine, Boot Camp File Vault. i have a late 2012 imac, and just did a clean install for high sierra on an external SSD. Many reported issues are related to the lack of understanding about APFS formatted SSDs.
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