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Mon, Mar 31, 2014 11:03 pm

Determining the boot disk for an OS X system

The bless command, which can be run from a Terminal window, can be used to determine the boot disk on an OS X system:
$ bless --info --getBoot

If you are interested in more details for that drive, you can use the diskutil info command followed by the drive's designation. E.g.:

$ diskutil info /dev/disk0s2
   Device Identifier:        disk0s2
   Device Node:              /dev/disk0s2
   Part of Whole:            disk0
   Device / Media Name:      Customer

   Volume Name:              Macintosh HD
   Escaped with Unicode:     Macintosh%FF%FE%20%00HD

   Mounted:                  Yes
   Mount Point:              /
   Escaped with Unicode:     /

   File System Personality:  Journaled HFS+
   Type (Bundle):            hfs
   Name (User Visible):      Mac OS Extended (Journaled)
   Journal:                  Journal size 24576 KB at offset 0x1119b000
   Owners:                   Enabled

   Partition Type:           Apple_HFS
   OS Can Be Installed:      Yes
   Media Type:               Generic
   Protocol:                 SATA
   SMART Status:             Verified
   Volume UUID:              A140B2C6-4C4F-3B14-B179-C1A7FE0325D4

   Total Size:               249.2 GB (249199599616 Bytes) (exactly 486717968 512-Byte-Blocks)
   Volume Free Space:        56.4 GB (56438132736 Bytes) (exactly 110230728 512-Byte-Blocks)
   Device Block Size:        512 Bytes

   Read-Only Media:          No
   Read-Only Volume:         No
   Ejectable:                No

   Whole:                    No
   Internal:                 Yes
   Solid State:              No

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