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My iMac stopped booting. Disk utility can’t repair the disk and it says back up as many of your files as possible, format the disk, and restore your back-up files. So I bought a Seagate Backup plus Slim but I realized it’s compatible with Mac OS 10.11 or higher.
iMac 21.5″, OS X 10.10
Pretty much any drive will work, it just has to be formatted correctly. In the case of Yosemite as GUID HFS. See: Erase and reformat a storage device in Disk Utility on Mac - https://support.apple.com/guide/disk-utility/erase-and-reformat-a-storage-device-dskutl14079/20.0/mac/11.0 - Choose the appropriate system version to get the correct document
Pretty much any drive will work, it just has to be formatted correctly. In the case of Yosemite as GUID HFS. See: Erase and reformat a storage device in Disk Utility on Mac - https://support.apple.com/guide/disk-utility/erase-and-reformat-a-storage-device-dskutl14079/20.0/mac/11.0 - Choose the appropriate system version to get the correct document
Thank you the reply. I followed the instructions but it doesn’t the option of
“Click the Scheme pop-up menu, then choose GUID Partition Map.”
All the choices are Mac OS Extended (4 different types including Journaled without and with encryption), MS-DOS(FAT) and ExFAT. Does this mean I can’t reformat for the older version OS? Thank you.
Mac extended journaled. NOT case sensitive.
I selected the one. Thank you. It says estimated time: 3 hours.
3 hours to format a drive???!! It usually takes 3-4 minutes.
Are there external drives compatible with the old iMac OS 10.10.5 (Yosemite)?
