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5.5   Esoteric Preferences

You can set esoteric DropDMG preferences by clicking the links on this page. Unlike with regular settings, you must generally quit and re-launch DropDMG in order for an esoteric preference to take effect.

When using the Append current date option, DropDMG usually uses the YYYY-MM-DD format. You can also set it to use the YYYY-MM-DD-HHMMSS format. This is useful if you will be creating more than one dated disk image on the same day and you want the files to have unique names.
Normally, DropDMG only appends the date or version number to the filename when you’re creating a new disk image. You can also set it to do this when converting.
When creating a disk image with a layout, DropDMG normally sets the size of the mounted image window to the size of the background picture. If you don’t specify a background picture, it uses 640×480. You can also set it to use 800×600.
DropDMG normally detects when you are trying to make a disk image of a volume and creates a device image. Device images are exact copies, and creating them is faster. You may, however, prefer that DropDMG create regular disk images of volumes, as this will give you control over the volume name.
Normally, DropDMG creates background pictures for your layouts that are optimized for Macs with both Retina and non-Retina displays. macOS 10.6 has a bug that prevents proper display of Retina background pictures (regardless of the Mac’s display type). Thus, for optimal deployment on 10.6 you can optionally set DropDMG to only create non-Retina background pictures.
Normally, DropDMG uses the macOS Extended filesystem (HFS+J) when creating a disk image from a folder, as this is the most compatible. You can also set DropDMG to use the APFS filesystem, as this will make it faster for end users to copy files from your disk image. Note that APFS should not be used when creating disk images that will be used with macOS 10.11 or earlier or when creating NDIF disk images.

When creating a .iso disk image, DropDMG normally includes a hybrid filesystem with HFS+, ISO 9660, Joliet, and UDF components. You can change which filesystems are included by entering this command in Terminal and removing the names of filesystems that you don’t want:

defaults write com.c-command.DropDMG HybridFSArgs -array "-hfs" "-iso" "-joliet" "-udf"
DropDMG layouts ordinarily use a grid size of 16×16 points. You can temporarily ignore the grid by holding down the Command key or change the grid size to 8×8.
Normally, the Software Update… feature will clean up after itself after downloading a new version. You can also set it to leave the disk image file in your Downloads folder.
When creating disk images using the .dmg — smaller file, faster option, DropDMG normally uses the maximum level of compression to produce a smaller disk image. You can instead set DropDMG to faster compression. On some systems this will be almost twice as fast, but the .dmg files will be larger.
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