Comments on: How to split DMG into segments

By: Danijel

Danijel — Wed, 04 Jun 2008 00:13:07 +0000

thnx for the help man, now i know that the terminal is way better and stable then other shitty apps, thnx alot for the help ^^

By: Ain Tohvri

Ain Tohvri — Fri, 01 Feb 2008 09:31:35 +0000

Try converting your read/write UDRW image to read-only UDCO with -format UDCO

By: Sam

Sam — Thu, 31 Jan 2008 17:25:15 +0000

This does not work, I get the following message:

hdiutil: segment: format UDRW not recognized
hdiutil: segment failed - Operation not supported

So wtf is wrong?

By: Matt White

Matt White — Tue, 13 Nov 2007 01:27:43 +0000

You can get a more detailed description by typing the following in Terminal

man hdiutil

By: Scott Perry

Scott Perry — Sun, 04 Nov 2007 21:25:05 +0000

using -segmentCount will save some of the more OCD people some internal struggle, splitting a disk image into num equally-sized segments.

By: Ain Tohvri

Ain Tohvri — Thu, 18 Oct 2007 23:23:54 +0000

It does not directly answer your question but if you’d like to password-protect your image with hdiutil you may want to try 2 additional options which are -encryption and -stdinpass.
The latter will read the password from standard input so you’ll be asked for it.
-encryption is required to force the encryption (defaults to CEncryptedEncoding that utilizes the AES cipher with a 128 bit key).

So for the above sample the command would be
hdiutil segment -o mydvd -segmentSize 100M -encryption -stdinpass /Users/[your Mac username]/Desktop/dvdimage.dmg

By: Wendy

Wendy — Thu, 18 Oct 2007 11:33:19 +0000

I’ve tried to type “hdiutil help” and gotten a long details of “hdiutil” methods. This is wonderful. How can you find out this things? It’s amazing. ^-^

By the way, do you know how to use “hdiutil chpass”?