Disk Jockey is a native Mac utility for reading, writing, and inspecting disk image formats used by classic home computers and software emulators.
What is Disk Jockey?
Disk Jockey is a purpose-built macOS application that lets you work with the proprietary floppy and disk image formats that powered 8-bit and 16-bit era machines — think Amiga ADF files, Commodore D64 images, Atari ST disk dumps, and similar legacy formats that macOS cannot touch natively. If you run emulators like FS-UAE, VICE, or Hatari on your Mac and need to manage the virtual media those emulators consume, Disk Jockey fills a gap that no built-in tool comes close to covering.
What does Disk Jockey do best?
Its strongest suit is making retro disk images first-class citizens on a modern Mac. I've used it to inspect ADF files sector-by-sector, extract individual files out of D64 images without spinning up a full emulator session, and build fresh blank images ready to receive data. That last part — creating writable images from scratch — is something that would otherwise require a Linux VM or a chain of command-line tools that barely anyone outside the demoscene can assemble from memory.
The analysis side is genuinely useful for preservation work. When you drag in a suspect image, Disk Jockey surfaces the filesystem structure, flags bad sectors, and tells you what it recognises — all without writing a single byte back to the file unless you ask it to. That read-first, non-destructive default is exactly the right posture when you're handling irreplaceable software archaeology.
- Create blank disk images in multiple retro formats
- Inspect filesystem layout, directory trees, and sector maps
- Extract individual files from inside images without mounting them
- Detect and report damaged or non-standard sectors
- Works alongside FS-UAE, VICE, Hatari, and other Mac emulators
Who should use Disk Jockey?
The target audience is narrow but passionate: retro computing enthusiasts, software preservation volunteers, emulator hobbyists, and the occasional game developer who wants to understand how vintage loaders actually worked. If you maintain a personal archive of Amiga or Commodore software, or if you contribute to archive projects like the ones hosted at The Internet Archive, this tool earns its keep quickly.
It is decidedly not for the casual user who fired up an emulator once to play Lemmings. The interface assumes you know what a D64 track layout is, or at least that you're willing to learn. macOS veterans who live in Finder and loathe the Terminal will find the learning curve steeper than expected — but the payoff for those who push through it is real.
Is Disk Jockey free?
Disk Jockey is free to download and use. The project is independently maintained by a single developer under the One Geek Army banner, and it carries no subscription or licence fee. That said, free and solo-maintained means you should temper expectations around update cadence and support response times — this is passion-project software, not a venture-backed product.
How does Disk Jockey compare to alternatives?
The honest answer is that direct competition on macOS is thin. Tools like HxD (Windows-only) or generic hex editors such as Hex Fiend can open image files as raw binary, but they offer zero understanding of retro filesystems. DiskImageMounter built into macOS handles standard ISO 9660 and HFS images but is completely blind to ADF or D64 formats. On Linux, disktype and cbmconvert cover some of this ground via the terminal, but there is no polished GUI equivalent on that platform either. For macOS users, Disk Jockey is essentially alone in its niche — which is both its strongest selling point and its biggest risk factor.
What are the best Disk Jockey alternatives?
If your needs are purely Commodore-focused, DirMaster on Windows is the gold standard for D64/D71/D81 management and is worth running under Parallels or Wine. For Amiga work, WinUAE's built-in disk panel gives you image manipulation as part of the emulator itself. On the preservation side, Greaseweazle hardware paired with its open-source Python tooling handles physical-to-digital workflows that Disk Jockey doesn't attempt. None of these is a like-for-like Mac replacement.
