Generally very good working condition. Hard drive has not been formatted and no key to the disk tray is supplied, but they are available online. Some scratches and marks to outer casing, especially the base, but otherwise working well. Rack mountable.

The Mackie SDR24/96 is indeed a 24-track hard disk recorder, part of Mackie's line of digital recording products. Similar to the HDR24/96, it was designed for professional audio recording and offered 24-bit resolution for high-quality audio capture. 

The SDR24/96 allowed users to record and play multiple tracks directly to a hard disk. Key features of the Mackie SDR24/96 may include: 24 Tracks: The recorder supports recording and playback of up to 24 tracks simultaneously, providing versatility for multitrack recording. 24-bit Resolution: With 24-bit audio resolution, the SDR24/96 aimed to deliver high-quality audio recordings with a wide dynamic range. 

Hard Disk Recording: Like the HDR24/96, the SDR24/96 recorded audio directly to a hard disk, offering the advantages of non-linear editing and efficient data storage. Editing Capabilities: The device likely included editing features such as cut, copy, paste, fade, and more, allowing users to manipulate and arrange recorded audio.