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The Apple Support Community will permanently close on November 20, 2026. Starting today, the site will no longer accept new posts and is available in a read-only state.
You can continue to find trusted guidance and support on the official Apple Support site.
We want to thank the community members who have contributed their time and expertise to help others with their Apple products.
I am trying to partition an external 2 TB SSD drive already formatted for Mac OS(journaled). Partition button is greyed out. Screen shot of the same is below. I have run First Aid and there is no issue. How do I make 2 partition of 1 TB each?
Thanks in advance for all the help
iMac, OS X 10.10
LR is already a partition; you can't "repartition" it. You need to partition the device (Samsung PSSD T7 ...).
At present you have a single 2TB partition (LR) on Samsung PSSD utilizing the entire space of Samsung PSSD. You will need to resize (shrink) the LR partition to free up space for the new partition you want to create. You do that via partitioning of Samsung PSSD. Once LR is resized, then, still on Samsung PSSD, you can add a partition using the space that was freed up from LR.
FWIW, the OP is only using 852.6 MB (~0.008%) of the drive, on HFS+ not APFS. There may be unstated reasons why the OP is using HFS+ and wants 2 partitions.
That said, with the external drive being an SSD it would be preferable to reformat it as APFS and create additional Volumes, not multiple partitions.
I would advise against partitioning any drive because later on people usually discover at least one of the partitions is too small. Currently you are already using almost half of the storage space with the large single partition. Purchase another drive, it will be a great investment.
MartinR wrote:
FWIW, the OP is only using 852.6 MB (~0.008%) of the drive, on HFS+ not APFS. There may be unstated reasons why the OP is using HFS+ and wants 2 partitions.
I guess I was a bit tired and so used to seeing GB most times. Thanks for the correction.
Thank you,
Partition button Greyed out
