User profile for user: JusKathryn
JusKathryn Author
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Mac OS Reinstall Challenges

I sure hope there is a Guru out there that can help. I've read this thread through and through and it does not address my issue. Close, but no cigar.

I am attempting to reinstall High Sierra from a flash drive to a 2010 Macbook Pro. The hard drive has been erased. When I get to the installer the message I receive is "The disk doesn't use the GUID Partition Table Scheme. Use Disk Utility to change the partition scheme. Select the device containing the disk, click the Erase button, select the Volume Schemem and then click Erase."

When I go back into Utilities, there is no way to change the partition scheme. The choice is not even available to me.

Is there someone brilliant out there that can help me PLEASE????

Posted on Feb 21, 2024 11:06 AM

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User profile for user: BDAqua
BDAqua
User level: Level 10
250,229 points

Posted on Feb 21, 2024 2:51 PM

What format is it?


What is the name of the Drive you're trying to Install to?


In Disk Utility>View, select Show all Devices, highlight the top left entry.


APFS won't work for Sierra or earlier, Sierra or earlier needs MacOS Extended Journaled. High Sierra won't work for APFS on earlier Macs.


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User profile for user: BDAqua
BDAqua
User level: Level 10
250,229 points

Feb 21, 2024 2:51 PM in response to JusKathryn

What format is it?


What is the name of the Drive you're trying to Install to?


In Disk Utility>View, select Show all Devices, highlight the top left entry.


APFS won't work for Sierra or earlier, Sierra or earlier needs MacOS Extended Journaled. High Sierra won't work for APFS on earlier Macs.


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User profile for user: HWTech
HWTech
User level: Level 9
67,712 points

Feb 22, 2024 9:21 AM in response to JusKathryn

The only destination option appears to be the internal Hitachi drive. Select the Hitachi drive and erase it as GUID partition and MacOS Extended (Journaled). If successful, quit Disk Utility and select "Install macOS" option to proceed with the install to the external Hitachi drive. Erasing the drive will destroy all data on that drive.


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Mac OS Reinstall Challenges

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