“Can this external HD be separated with one part used for daily Time machine backups and the other part for a bootable catilina installer ? If I wanted Best Buy to separate this WD 2TB HD ahead of time for my mac desktop?”
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Yes; you may do this in Disk Utility. Format the drive as HFS+ (MacOS Extended, Journaled). Name it TM Backup. Then partition the drive using a 15 GB partition for the Catalina installer; also as MacOS Extended, Journaled; name it Installer. Use the instructions here (https{colon slash slash}support.apple.com/en-us/HT201372) to create the Catalina installer on the 16GB partition named "Installer". Then tell TimeMachine to use the other partition (TM Backup). Done. Do note that a TM Backup disk also contains the necessary files to boot that machine and restore it to the last backup. In other words: You don't actually need to create a separate partition with a Catalina installer (unless you intend to use that installer for other Macs).
Sorry, there was a problem. Please try again later.Hi trish, Please be informed that the WD Easystore drive is a plug and play device tested and designed for Windows and Mac computers for seamless operation. The Drive can be formatted and portioned for Mac OS by referring to the link- https://support-en.wd.com/app/answers/detail/a_id/8200, the use of the portioned space depends on the user requirement. Need Help? Please see our "'Contact Us" page for information.
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