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# 5.1.3 Segments

Segmented Disk Images

DropDMG lets you split large disk images into multiple pieces, to keep the size of each file below a set limit. This can be useful for transferring large files over the Internet or burning them to disc. The filenames of the pieces will end with `.dmg`, `.002.dmgpart`, `.003.dmgpart`, etc.

To access the contents of a segmented disk image, make sure the `.dmg` file and all the `.dmgpart` files are in the same folder. (If you had burned the pieces to disc you would need to copy them all back to the same folder on a hard drive.) Then double-click the `.dmg` file or use DropDMG’s Mount Image… command.

To split an existing disk image into smaller pieces, set the segment size and then use the Convert Image/Archive… command.

To join multiple segments into a single disk image file, make sure that all the segments are in the same folder, uncheck Limit segments to ___ MB, and then use the Convert Image/Archive… command.

Segmented ZIP Archives

DropDMG can create segmented ZIP archives (e.g. `.z01`, `.z02`, `.zip`). Such archives cannot be expanded by macOS’s built-in Archive Utility, but there are free third-party expansion utilities such as The Unarchiver.

Segment Sizes

Sizes are specified in megabytes (base 10). The Sizes pop-down menu lets you enter common segment sizes for CDs, DVDs, and Blu-ray discs. The sizes are chosen so that a segment of that size can be burned to the disc as a file. The actual disc capacities may vary slightly, as will the sizes of the segments produced by the disk imaging engine.

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