11
votes
Accepted
How to create a read-only RAM disk on macOS from the command line?
Get the device number of the RAM disk: diskutil list (e.g. disk3)
Add some content to the RAM disk 😉.
Unmount the volume: diskutil umount disk3
Mount the RAM disk read-only: diskutil mount readOnly /...
- 65.9k
8
votes
Accepted
All of a sudden can't open .dmg files on Monterey
I fixed it! - I recently ran a command to stop receiving annoying messages about umounted drives:
sudo defaults write /Library/Preferences/SystemConfiguration/com.apple.DiskArbitration....
- 256
6
votes
Accepted
Create dmg file on macOS 10.14 that can be opened on macOS 10.11
If the source folder is in a APFS volume, then by default a APFS volume will be created in the dmg file. This type of volume can not be read by El Capitan. The solution would be to create a dmg file ...
- 37.9k
4
votes
Accepted
hdiutil within "darling" can't do anything but "attach" and "detach". Can it be improved or something else?
The hdiutil program you're running is not Apple's - it is a separate program made in the Darling project that just happens to be named hdiutil. They're probably hoping to eventually implement the ...
- 75.5k
3
votes
Accepted
Using hdiutil to create a blank .dmg image in the current directory
You got it all right. Just give it a name for the image file (the .dmg/.sparseimage), and maybe a name for the virtual volume, if you don't want it named "untitled":
hdiutil create -size ...
- 851
3
votes
Accepted
Can I attach a .dmg without mounting the drive that it is sitting in?
If you mount a drive one of the things which happens is that the file system type gets identified so macOS afterwards knows how to access the content of the drive (and find the DMG for instance). So ...
- 97.1k
2
votes
How to create a read-only shadow for existing RAM disk on macOS?
Start by finding the device node for your RAM disk by running the following in the Terminal:
diskutil list
You'll find that the ram disk is probably listed as something like disk3, disk4 or similar.
...
- 75.5k
2
votes
How to Mount a Sparsebundle Disk Image from Time Machine Backup?
If you are ok with creating a temporary shadow file, you can mount it this way:
hdiutil attach -shadow /path/to/store/the/temporary/file.shadow /Volumes/Backup/Backups.backupdb/MachineName/Latest/...
- 151
2
votes
How to mount the pc/iso partition of an iso file when it also contains an HFS partition?
You can check that the .iso file does indeed have an HFS/HFS+ volume on it with the file command (I can't remember if this is native or if I installed it via homebrew... might have to do that yourself)...
- 381
2
votes
Accepted
How to calculate RAM disk size on OS X Mojave—500 or 512 byte block size?
This seems simple enough. You asked for 12000000 sectors. The sector size is 512 bytes. So 12000000 * 512 = 6.1 GB which is the size of disk15. If a block size of 500 bytes was substituted for the 512 ...
- 37.9k
1
vote
Accepted
Error hdiutil: create failed - File exists -> but the file does not exist until this command fails
This is a workaround for the issue, but not a resolution. This allows me to use the image on the NFS share, but I still can't create it directly on the NFS share.
% hdiutil create -size 300g -type ...
- 435
1
vote
Accepted
Shrink disk image to eliminate free space
Passing -imageonly to hdiutil resize seemed to do the trick:
hdiutil resize -sectors min -imageonly image.dmg
After this command completes, the size of the disk has shrunk to 15 GB and the free space ...
- 467
1
vote
How extract a Time Machine snapshot as a full machine volume?
I know that you are preferably looking for a command line solution, but have you checked Carbon Copy Cloner or Super Duper to see if they shouldn't be able to copy the whole Time Machine folder to ...
- 39
1
vote
Creating floppy disk images from folders of data files for VirtualBox
I executed the command from your question, which is also shown below.
hdiutil create -size 1440k -fs "MS-DOS FAT12" -layout NONE -srcfolder disk2 -format UDRW -ov diskimage2.ima
A ...
- 37.9k
1
vote
Accepted
How to properly unmount image (dmg / sparsebundle)
The man page for hdiutil(1) states
detach dev_name [-force]
detach a disk image and terminate any associated process. dev_name is a partial /dev node path (e.g. "disk1"). As ...
- 4,727
1
vote
hdiutil convert -format UDRW not truly editable
This might help people who are still running into this issue. In my case, the DMG was mounted which gave the error "Resource temporarily unavailable", when I tried to use "hdiutil ...
1
vote
How to mount a .dmg file with a different volume name (or modify it once mounted)?
It sounds like your disk image is in a non-writable format.
If this is the case, try converting your disk image to a writable one, using Images > Convert in Disk Utility's menu bar, and selecting &...
- 11
1
vote
hdiutil attach -shadow not working
Alas, it seems that either macOS has changed the format of .shadow files in a breaking way, or that my .shadow files are corrupted (hundreds of them) without any corruption to the DMGs themselves (...
1
vote
Can I attach a .dmg without mounting the drive that it is sitting in?
The reason testdisk fails is because it needs to write to the device, but your dmg is probably stored in read-only format, so it is not able to write to the virtual device that represents the dmg.
...
- 2,403
1
vote
How can I hide a ramdisk from Finder?
Try
chflags hidden "/Volumes/RamDisk"
And restart your finder with
killall Finder
- 6,564
1
vote
Accepted
How to remove files from a sparsebundle file (previous Time Machine image)?
So the comment @GordonDavisson gave above got me thinking about permissions and with a little extra searching I ended up finding this answer to How can I delete Time Machine files using the ...
- 406
Only top scored, non community-wiki answers of a minimum length are eligible