{"id":"external-drives.how-do-i-add-a-volume-to-an-external-drive","url":"/faq/external-drives/how-do-i-add-a-volume-to-an-external-drive","category":{"id":"external-drives","title":"External drives"},"subcategory":{"id":"formats","title":"Drive formats"},"question":"How do I add a second APFS volume to an external drive?","alt_questions":["Add APFS volume Disk Utility","Create another volume on external SSD","APFS volume vs partition external drive","separate volume for Time Machine on same drive"],"short_answer":"In Disk Utility, select a volume on the APFS drive and click + (Add Volume). The new volume appears as its own drive without erasing anything, and all volumes share the drive's free space unless you set a reserve or quota.","answer_markdown":"In Disk Utility, select an existing volume on the APFS drive and click the **+** (Add Volume) button in the toolbar, then name it and choose its format. It appears as a separate drive in Finder straight away, without erasing anything.\n\nUnlike partitions, APFS volumes **share the drive's free space**, so you don't have to decide sizes in advance (you can set a reserve or quota if you want limits). That makes a separate volume a tidy way to keep, say, Time Machine backups apart from other files. See [splitting one drive for Storage Studio and other uses](/faq/external-drives/can-i-split-one-drive-into-storage-studio-and-other-uses).","answer_html":"

In Disk Utility, select an existing volume on the APFS drive and click the + (Add Volume) button in the toolbar, then name it and choose its format. It appears as a separate drive in Finder straight away, without erasing anything.

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Unlike partitions, APFS volumes share the drive's free space, so you don't have to decide sizes in advance (you can set a reserve or quota if you want limits). That makes a separate volume a tidy way to keep, say, Time Machine backups apart from other files. See splitting one drive for Storage Studio and other uses.

","answer_text":"In Disk Utility, select an existing volume on the APFS drive and click the + (Add Volume) button in the toolbar, then name it and choose its format. It appears as a separate drive in Finder straight away, without erasing anything.\n\nUnlike partitions, APFS volumes share the drive's free space, so you don't have to decide sizes in advance (you can set a reserve or quota if you want limits). That makes a separate volume a tidy way to keep, say, Time Machine backups apart from other files. See splitting one drive for Storage Studio and other uses.","tags":["apfs volume","disk utility","partition"],"related":[{"id":"external-drives.can-i-split-one-drive-into-storage-studio-and-other-uses","question":"Can I split one external drive into a Storage Studio part and a part for other things?","url":"/faq/external-drives/can-i-split-one-drive-into-storage-studio-and-other-uses"},{"id":"external-drives.can-i-encrypt-just-part-of-an-external-drive","question":"Can I encrypt just part of an external drive?","url":"/faq/external-drives/can-i-encrypt-just-part-of-an-external-drive"},{"id":"external-drives.can-i-use-my-time-machine-drive-as-the-fast-drive","question":"Can I use my Time Machine backup drive as the fast drive?","url":"/faq/external-drives/can-i-use-my-time-machine-drive-as-the-fast-drive"}],"applies_to":"all","last_reviewed":"2026-10-01","title":"How do I add a second APFS volume to an external drive? — Storage Studio FAQ","description":"In Disk Utility, select a volume on the APFS drive and click + (Add Volume). The new volume appears as its own drive without erasing anything, and all volumes share the drive's free space unless you set a reserve or quota.","crumbs":[{"name":"Home","path":"/"},{"name":"FAQ","path":"/faq/"},{"name":"External drives","path":"/faq/external-drives/"},{"name":"How do I add a second APFS volume to an external drive?","path":"/faq/external-drives/how-do-i-add-a-volume-to-an-external-drive"}],"jsonld":{"@context":"https://schema.org","@type":"FAQPage","url":"https://storagestudio.us/faq/external-drives/how-do-i-add-a-volume-to-an-external-drive","inLanguage":"en","dateModified":"2026-10-01","mainEntity":[{"@type":"Question","name":"How do I add a second APFS volume to an external drive?","alternateName":["Add APFS volume Disk Utility","Create another volume on external SSD","APFS volume vs partition external drive","separate volume for Time Machine on same drive"],"acceptedAnswer":{"@type":"Answer","text":"In Disk Utility, select an existing volume on the APFS drive and click the + (Add Volume) button in the toolbar, then name it and choose its format. It appears as a separate drive in Finder straight away, without erasing anything.\n\nUnlike partitions, APFS volumes share the drive's free space, so you don't have to decide sizes in advance (you can set a reserve or quota if you want limits). That makes a separate volume a tidy way to keep, say, Time Machine backups apart from other files. See splitting one drive for Storage Studio and other uses.","url":"https://storagestudio.us/faq/external-drives/how-do-i-add-a-volume-to-an-external-drive"}}]},"fragment":"
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External drives · Drive formats

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How do I add a second APFS volume to an external drive?

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Short answer: In Disk Utility, select a volume on the APFS drive and click + (Add Volume). The new volume appears as its own drive without erasing anything, and all volumes share the drive's free space unless you set a reserve or quota.

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In Disk Utility, select an existing volume on the APFS drive and click the + (Add Volume) button in the toolbar, then name it and choose its format. It appears as a separate drive in Finder straight away, without erasing anything.

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Unlike partitions, APFS volumes share the drive's free space, so you don't have to decide sizes in advance (you can set a reserve or quota if you want limits). That makes a separate volume a tidy way to keep, say, Time Machine backups apart from other files. See splitting one drive for Storage Studio and other uses.

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