convert to APFS?

[bchesneau]

I am trying to convert to APFS my new Sandisk Extreme 900 but I can’t use the describe way in support. Th eoption to convert in UI is greyed:

and using the command line return :

○ → sudo diskutil apfs convert /dev/disk2s1 Password: Error starting conversion from HFS to APFS: A GUID Partition Table (GPT) partitioning scheme is required (-69773)

Partitionning is disabled in the UI, I guess it can be done in console, but is it safe? Did others tried it?

[drlucky]

You need to change the drive to a GUID partition scheme. The knowledgebase article below should help.

https://kb.sandisk.com/app/answers/detail/a_id/20542/

[H-Gary]

macOS allows users to to format or erase the entire disk to APFS. But the “Convert to APFS” feature is available when you right-click on a volume, otherwise, the “Convert to APFS” will be greyed out.

From the picture you provided, you are selecting the whole disk of "Sandisk Extreme 900 ". Now try selecting volumes one > right-click one volume of the disk > select Convert to APFS… in the dropdown menu. Also read: The “Convert to APFS” Option is Greyed Out or Not Available

[Journeyyuyu]

This isn’t a SanDisk issue — it’s the partition scheme.

APFS requires GUID Partition Table (GPT). Your drive is formatted as MBR, which is why the APFS option is greyed out and the Terminal command fails. macOS cannot convert MBR to GPT in place.

Solution (safe & supported):

• Back up your data (required).

• Open Disk Utility → View Show All Devices.

• Select the physical drive, click Erase.

• Choose Scheme: GUID Partition Map, Format: APFS.

• You can also do it in Terminal, but it will erase the disk. There’s no non-destructive workaround.

You may find a detailed guide here.