diskutil rename error: "does not appear to be a valid volume name for its file system"

I'm trying to rename the volume name of a mounted ISO image using the command:

diskutil rename /dev/disk15 TEST_DISK_2014_RENAMED

I get the error:

TEST_DISK_2014_RENAMED does not appear to be a valid volume name for its file system

I tried running this with sudo with the same results.

$ diskutil info /dev/disk15:

Device Identifier: disk15
Device Node: /dev/disk15
Part of Whole: disk15
Device / Media Name: Apple read/write Media
Volume Name: TEST_DISK_2014
Escaped with Unicode: TEST_DISK_2014
Mounted: Yes
Mount Point: /Volumes/TEST_DISK_2014
Escaped with Unicode: /Volumes/TEST_DISK_2014
File System Personality: UDF
Type (Bundle): udf
Name (User Visible): Universal Disk Format (UDF)
Content (IOContent): None
OS Can Be Installed: No
Media Type: Generic
Protocol: Disk Image
SMART Status: Not Supported
Total Size: 84.0 MB (83996672 Bytes) (exactly 164056 512-Byte-Blocks)
Volume Free Space: 0 B (0 Bytes) (exactly 0 512-Byte-Blocks)
Device Block Size: 512 Bytes
Read-Only Media: No
Read-Only Volume: Yes
Ejectable: Yes
Whole: Yes
Internal: No
OS 9 Drivers: No
Low Level Format: Not supported

$ bash --version:

GNU bash, version 4.3.27(1)-release (x86_64-apple-darwin12.5.0)

Variations:

diskutil rename TEST_DISK_2014 TEST_DISK_2014_RENAMED
diskutil rename /Volumes/TEST_DISK_2014 TEST_DISK_2014_RENAMED
diskutil rename /Volumes/TEST_DISK_2014 /Volumes/TEST_DISK_2014_RENAMED
/Volumes/diskutil rename TEST_DISK_2014 "TEST_DISK_2014_RENAMED"
diskutil rename TEST_DISK_2014 'TEST_DISK_2014_RENAMED'
diskutil rename 'TEST_DISK_2014' 'TEST_DISK_2014_RENAMED'
diskutil rename "TEST_DISK_2014" "TEST_DISK_2014_RENAMED"

Nothing works.

So what's the story? What is the proper syntax? I could find no other examples.

1 Answer

I found the solution on this blog post:

If you are trying to use the terminal in OS X to reformat a volume and you are getting “error: does not appear to be a valid volume name for its file system” – You need to capitalize the name of every letter in the name you are trying to specify like this:

diskutil partitionDisk /dev/disk2 1 MBRFormat "MS-DOS FAT32" EDISON 805.30M`