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How To Create A RAM Disk On OS X

03.30.2006

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        32768 = size in sectors (16MB in this case, a sector is 512 bytes)

$ hdid -nomount ram://32768
/dev/disk1
$ newfs_hfs /dev/disk1
$ mkdir /tmp/ramdisk1
$ mount -t hfs /dev/disk1 /tmp/ramdisk1


To unmount:

hdiutil detach /dev/disk1

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Snippets Manager replied on Tue, 2008/06/17 - 7:55pm

a simple way There is a simpler way to create a ram disk described here: http://mac.wikia.com/wiki/RAM_disk#Creating_a_RAM_disk You can do in a single line.

Snippets Manager replied on Mon, 2007/04/23 - 8:32am

Yo :) I have thrown together a quick script for anybody that wants to create a ramdisk regularly. It's flexible enough for me, but can be edited to offer more options (if u know a little .sh scripting). The disk is dynamicly named and will show up on the desktop when the script is finished. Unmounting can be done as any drive in the finder. The major differences between my and the above approach is that I use diskutil to mount the created drive, so Finder likes it better, and i give the volume a label, so it can be better recognized by the user ... Here it is: Leila:~ samynew[14:30:55]$ cat ramdisk #!/bin/bash if [ -n "$2" ]; then ARG_ERR=ERR; fi if [ -z "$1" ]; then ARG_ERR=ERR; fi if [ -n "$ARG_ERR" ]; then echo 1 argument: size in MB exit fi MB_SIZE=$1 let "MB_SIZE *= 2048" echo Creating ${MB_SIZE} 512-blocks ramdisk CREATED_RAMDISK=`hdid -nomount ram://${MB_SIZE}` echo New block device: ${CREATED_RAMDISK} DISK_NAME=`basename ${CREATED_RAMDISK}` echo Creating volume with label: ${DISK_NAME} newfs_hfs -v ${DISK_NAME} /dev/r$CREATED_RAMDISK echo Mounting in /Volumes/${DISK_NAME} mkdir /Volumes/${DISK_NAME} diskutil mount ${CREATED_RAMDISK} Make sure it's chmodded to be executable: chmod u+x ramdisk Run as: ./ramdisk I hope u like it.. :) Grtz -- H3rbz