Disk Jockey

Disk Jockey is a macOS application that lets you create disk images and analyze existing ones.

It can create images that work in devices like BlueSCSI, FloppyEmu and RaSCSI, as well as in emulators like Basilisk II and Mini vMac.

It can analyze images that either contain a single volume, or entire devices. It can show the contents of HFS and MFS partitions. And it can perform a few neat tricks like converting an existing image that works on Basilisk II into an image that works on BlueSCSI or RaSCSI, or replacing your Lido SCSI driver by a classic driver that will improve performance in modern solutions.

And if you prefer to use the command line (or wish to automate your disk image creation), Disk Jockey Jr can help!

Don’t feel like reading? Download it here

Image Creator

The image creator appears when you start the application.

If you’re in a hurry, tell it the size of the disk image you want, tell it what you’re going to use the disk image with, and click the button. An instant later, you should have a fresh new disk image (with a proper name) in your Downloads directory. The machine or emulator you’ll be using it with will prompt you to format it.

A screenshot of Disk Jockey in simple mode

If you’re a stickler for authenticity, Disk Jockey has you covered as well: it knows of most Macs equipped with SCSI, and the capacity of their hard drives. Tell it what Mac you have (or want to emulate) and it’ll tell you the period-accurate sizes that you should use:

A screenshot of Disk Jockey in classic config mode

Disk Jockey and SCSI drives

If you tell it you’ll be using the disk image in BlueSCSI or RaSCSI, Disk Jockey will automatically partition your disk image (creating one volume using all the available space) and install a SCSI driver for you, so it’s ready to go:

A screenshot of Disk Jockey with SCSI config

For BlueSCSI, you can also tell Disk Jockey which SCSI ID you want your disk image to be assigned to, and it will name it properly.

Floppies! CD-ROMs! DVDs!

Disk Jockey can also create images of floppies, CD-ROMs and others. Tell it you want to use a classic configuration and look under “Other”.


Drag an image to the Disk Jockey window (or use the open menu item) and the new Disk-O-Matic window appears. It scans your image and displays its contents. It lists the various partitions it finds and, if it knows how, it shows you the contents of those partitions (currently, HFS and MFS volumes can be displayed).

This is Disk-O-Matic showing the contents of a disk image containing a single volume:

A screenshot of Disk-O-Matic showing the contents of a single volume

And this is Disk-O-Matic showing the contents of a Device Image (used by BlueSCSI or RaSCSI, for example):

A screenshot of Disk-O-Matic showing the contents of a device image


Disk Jockey will never modify an existing image. It only creates new images based on existing ones. So your precious data is never at risk.

Disk Jockey Jr (djjr)

Disk Jockey Jr is a disk image builder that runs on the command line. It’s been notarized, so there won’t be any shenanigans.

You install it using the package downloadable below, or by deploying it directly from Disk Jockey (it’s in the “File” menu). The installer will place it in /usr/local/bin/.

djjr --help will give you the options, but here’s a quick list:


djjr -sM 20 -d -o "HD10_512 20MB.hda"

will create a new device image in the current directory. It will be 20 MB in size (-sM 20) and it will contain everything it needs to work as a device (-d). It will be named “HD10_512 20MB.hda” (-o "HD10_512 20MB.hda").

System Requirements

Disk Jockey is an application for macOS, running on the following versions:

It’s small, works offline, and only writes files to your Downloads directory. It runs natively on Intel and M1 machines. It supports Dark Mode 🤘.

And it’s been notarized by Apple so you know it won’t mess anything up.

It’s free 🎉.

If you like it, say hi on Twitter or send an e-mail to dj at onegeekarmy.eu (in one word). I’m OneGeekArmy#1358 on Discord.


Disk Jockey v2.1 (with Disk Jockey Jr) is available right here: Disk-Jockey-v2.1.zip

If you only want Disk Jockey Jr, the installer is here: Disk Jockey Jr-v1.0.zip

A bug to report? An enhancement to suggest?

Disk Jockey has a dedicated page on GitHub.

Version History