Before creating large disks check from Apple documentation if memory is de-allocated after hdiutil detach1
This guide has only CLI steps: using GUI tools might work but not covered here.
hdiutil attach -nomount ram://2097152
- creates a new “disk“ with 1 GB space
- given unit is 512 bytes
- 2048 units = 1 MB
- 2097152 units = 1 GB
- more unit examples on 1
- the command return device it created. E.g.
/dev/disk4
diskutil list
- lists available disks and volumes
- doublecheck name of the device
diskutil erasevolume HFS+ "RAMDisk" <device>
- formats device/volume
<device>must match with the output ofhditil attach ...command- disk is automatically mounted on
/Volumes/RAMDisk
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Unmount device
umount -f <device>
Delete RAMDISK
hdiutil detach <device>