View source for DSK (Apple II)

{{FormatInfo
|formattype=electronic
|subcat=Disk Image Formats
|extensions={{ext|dsk}}, {{ext|do}}, {{ext|po}}, {{ext|hdv}}
}}

The Apple II '''DSK''' format (not to be confused with the Amstrad [[DSK (CPCEMU)]] format) is a group of formats reproducing the sector structure of floppy disks for the Apple II series, including [[Apple II 16 sector disk]]s and [[Apple ProDOS]] disks, usually containing files in an [[Apple DOS file system]] or [[ProDOS file system]].

The '''.dsk''' extension can technically refer to any of several formats in this family, but in practice it is predominantly used for 5 1/4" disk images in DOS 3.3 sector order, and is the most common extension for such disk images.

The '''.do''' extension refers to 5 1/4" disks in DOS 3.3 sector order, but this extension is seldom encountered since .dsk is usually used instead.

The '''.po''' extension refers to disk images in ProDOS sector order.

The '''.hdv''' extension refers to larger disk images, including images of 3 1/2" disks and hard disks, in ProDOS order.

The "DOS 3.3" vs. "ProDOS" orders refer to the order of the sectors in the file corresponding to how those respective operating systems arrange sectors on the disk, but the actual data might not be for the same operating system as their sector order implies.

A normal 5 1/4" disk image contains 35 tracks, each with 16 sectors of 256 bytes each, for a total of 143,360 bytes. The bytes are stored in these files in their raw form, with no headers or separators added.

== Tools ==
* [http://stjarnhimlen.se/apple2/#FID FID: File Developer] (lists contents of DSK images)
* [https://github.com/paleotronic/diskm8 DiskM8]
* [https://github.com/paleotronic/dskalyzer DSKalyzer]

== Emulators ==
* [http://tulip-house.ddo.jp/digital/SDISK2/english.html Disk emulator for Apple II]
* [http://applewin.berlios.de/ AppleWin emulator]

== Sample files ==
* {{DexvertSamples|archive/appleDOSDiskImage}}

== Links ==
* [http://apple2.org.za/gswv/a2zine/faqs/Csa2FLUTILS.html#006 What are DSK, PO, DO, HDV, NIB, and 2MG "disk image" files and how do I use them?]
* [http://www.robertgomez.org/content/apple-ii-running-your-favorite-software-past Apple II: Running your favorite software from the past]

[[Category:Apple II series]]