Why does my iMac 12.1 with Hi Sierra format 4 TB hard drives to 1.8 TB in size.

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lulukom Author

Level 1

4 points

Why does my iMac 12.1 with Hi Sierra format 4 TB hard drives to 1.8 TB in size.

I checked on three different disks.. What can I do? Thank you .

Posted on Jan 17, 2024 7:14 AM

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Answer 1

Top-ranking reply

D.I. Johnson

Level 8

40,511 points

Jan 17, 2024 7:48 AM in response to lulukom

Have you reformatted these drives since you bought them? They may be limited in size of they are using the MBR partition map common for Windows formatted drives.

Use Disk Utility to reformat them with the Mac OS Extended (Journaled) format and the GUID partition scheme.

Disk Utility User Guide for Mac - Apple Support

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Answer 2

lulukom Author

Level 1

4 points

Jan 17, 2024 8:48 AM in response to D.I. Johnson

Thank you very much for your answer. I think the answer there is correct - I need to look for a box with SATA 3, instead of my SATA 2.

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Answer 3

Jan 17, 2024 8:20 AM in response to lulukom

I found this old thread regarding drives and enclosures after a quick google search, maybe pertinent (?).

Max size drive for Mac OS X - Ask Different

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Answer 4

lulukom Author

Level 1

4 points

Jan 17, 2024 8:01 AM in response to D.I. Johnson

Thank you . You're right, it happens, but that's exactly what I do - I reformat it with Disk Utility in Mac OS Extended (Journaled).

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Answer 5

Jan 17, 2024 9:03 AM in response to lulukom

You're welcome. 🙂

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Why does my iMac 12.1 with Hi Sierra format 4 TB hard drives to 1.8 TB in size.

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