↝ OWC / MacSales.com... ↜
↝ diglloyd Deal Finder... ↜
Buy other stuff at Amazon.com...
How to Partition A Fusion Drive
Shown below are two partitions of the Fusion drive in Disk Utility.
To partition a Fusion drive:
- Backup your stuff (two backups strongly recommended).
- Boot off any working drive (e.g. one of your backup clones).
- Erase the Fusion drive (because your stuff might not fit on a downsize partition).
- In the Partition tab, click the + button.
- Drag the slider between the partitions to size as desired.
- Set a name for the 2nd partition.
- Clone your system back to the new Boot volume (if too large, move some items first to the new 2nd volume).
- Copy your other data (data not going onto the Boot volume) onto the 2nd volume.
- Set the startup volume to the new Boot volume, reboot.
Note that Disk Utility has a bug in displaying the actual volume size in the Partition tab, the actual size produced as shown here is 186GB, not 195GB).
As shown, the volume “helios” is a PCIe SSD, used as the boot drive used while doing the partitioning; one must boot off a different volume in order to rejigger the Fusion drive— cloning is fast and easy, see also How to upgrade your system/boot drive.
Actual SSD and HDD drive sizes in the late 2012 iMac with Fusion 1tb are as follows:
APPLE SSD SM128E: 121.3 GB = 121332826112 bytes = 118489088 1024K blocks
APPLE HDD ST1000DM003: 1000.2 GB = 1000204886016 bytes = 976762584 1024K blocks
$1649 SAVE $150 = 8.0% Apple 13.3" MacBook Pro with Touch Bar (Late 2016, Space Gray) in All Other Categories
$3349 SAVE $150 = 4.0% Apple 15.4" MacBook Pro with Touch Bar (Late 2016, Space Gray) in All Other Categories
$599 SAVE $80 = 11.0% Apple 9.7" iPad Pro (32GB, Wi-Fi + 4G LTE, Rose Gold) in Electronics: iPads and Tablets
$6499 SAVE $500 = 7.0% Apple Mac Pro Desktop Computer (Twelve-Core, Late 2013) in Computers: Apple Macs
$380 SAVE $320 = 45.0% Dracast LED500 Pro Bi-Color LED Light with V-Mount Battery Plate in Lighting: LED