Note: read those support discussions all the way through as it seems there are some gotchas, like sometimes a need to reboot. And it seems those bits are quite different than the actual values reported by Apple disk utilities. ![]() But it both retrieves and sets it as a sequence of 64 bits (expressed in hex). The SuperDuper! backup utility for Mac OS X has a "hidden" command line tool that would let you retrieve and set a volume UUID. One thing that makes me think so is not only statement that it the code seems to only use 64 bits but also the way the UUIDs are handled by the "secret" utility that comes with SuperDuper! However it does involve a "namespace" UUID (to identify the fact that we are "naming" a disk volume) and then a "name" (the actual identifier of the disk). This does not involve computer component values, current time etc. It seems likely that the actual disk identifier (taking the place of the name in the specification) is just 64 bits, converted into a 128 bits UUID according to the specification by prepending the UUID of whatever namespace Apple is using for volume identifiers and then applying an MD5 hash. The UUIDs used for HFS+ volumes seem to be all of the variant covered by the UUID specification and be of the version 3 type, that is a namespace and a name converted to an UUID via MD5 (see details on wikipedia). I havent looked into the source code of hfs.util and it is probably too late to be useful for you, but I think I can contribute something useful. Lastly, I grabbed this file and added it to the working dir Here are the changes I made to be able to compile the tool from source OS X 10.6.8:Īnd, as hinted in this article, added the following from line 166 in fs.c to hfsutil_main.c (since namespace.h isn't anywhere on the system): static unsigned char kFSUUIDNamespaceSHA1 = So before I waste anymore time, does anyone know of an easy way to do this? Or would any C experts like to join my endeavor in making hfs.util change the UUID to a specified value? I'm willing to have a go at it again after I get some rest, but I figure there has got to be an easier way to change a volume's UUID that I just don't know of. Several compile errors and segfaults later, I lost enthusiasm for trying to modify this tool. I considered modifying the hfs.util source to allow me to specify values.Īs I was poking around the code looking for where to begin making changes I remembered why C is not my favorite language. Only difference is I want to change it to a specific value, not a random one. How does one change the UUID of a Volume on Mac OS X 10.6? ![]() An agent adding logging to your java programs at runtime The uptime of this host.This is similar to the question asked here: ![]() Contact information on the homepage of this host. Extract the time from a version 1 UUID More information about UUIDs. ![]() If you need fresh UUIDs in your program or script at runtime, please make use of a suitable function or library, and please do not try to DDOS this page. Please do not use UUID from a cached paged. If you cannot agree to those terms do not use the generated UUID. The entire risk of using this UUID is upto you. Generate multiple UUIDs at once: (at most 500 at once) Generate UUIDs of another type: Generate UUIDs in uppercase Generate UUIDs with braces This type of UUID is generated using the current time, a clock id which changes in case the current time is found to be older than the latest known time a UUID is generated and an IEE 802 hardware address which should be unique.Still the following disclaimer applies:ĭisclaimer: The provided UUID (GUID) is provided AS IS without warranty of any kind, not even the warranty that the generated UUID is actually unique. The following version 1 UUID / GUID is generated for your use: b1cb9140-0c3d-11ed-aa05-0800200c9a66 This UUID is generated according to RFC 4122 Using the timestap / nodeid version (version 1), where the nodeid comes from network equipment I own.
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