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You bought all of it proper. Simply give it a reputation for the picture file (the .dmg/.sparseimage), and perhaps a reputation for the digital quantity, if you don’t need it named “untitled”:
hdiutil create -size 100m -type SPARSE -fs 'Case-sensitive APFS' -volname myVolName myFileName
You most likely do not need a sparsebundle, as a result of below the hood it is a folder filled with separate recordsdata. It was created for efficiency optimization for distant Time Machine backups on a networked exhausting drive (or different NAS or fileserver), however for native use, you most likely need one thing that’s only a single file. If you wish to preallocate the entire 100MiB on disk even earlier than you write something to the digital disk, then use UDIF (UDRW) and you will get a ~100MiB .dmg file containing a ~100MiB digital filesystem. If you need the picture file to start out out small and solely develop to ~100MiB if you replenish its digital filesystem, then use SPARSE, and you will get a small .sparsefile picture that grows as much as ~100MiB as you copy recordsdata into the digital filesystem.
By specifying the scale you need it to be (and never giving it an enter folder to construct the disk picture round), it assumes you need a clean picture with a filesystem of that measurement.
As is customary for the Unix command line, when you specify the title of a brand new file with out a path, it is assumed you need it created within the listing you are at the moment in; that’s, within the shell’s present working listing, as reported by the pwd (print working listing) command.
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