The Conner CTM 420R-F (often branded under Conner Peripherals or rebadged by Mountain Network Solutions as part of the FileSafe TD-420 line) is a classic piece of mid-1990s retro-computing hardware.
Here is a breakdown of its technical specifications, how the floppy interface works, and what it takes to use one today.
💾 Core Technical Specifications
- Format & Standards: It is a QIC (Quarter-Inch Cartridge) style drive utilizing QIC-80 standards.
- Capacity: * 210 MB native (using standard QIC-80 tapes like the Sony QD2120).
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- 420 MB compressed (hence the "420" in the model name), which was typical marketing for the era.
- Note: It can also read/write to later QW5122F mini-cartridges and is physically compatible with some early Travan (TR-1) tapes, though it will only format them up to its maximum QIC-80 capacity.
- Form Factor: 3.5-inch internal drive (frequently found fitted with 5.25-inch mounting brackets to fit into standard desktop drive bays).
🔌 The Floppy Connector Interface
The "-F" suffix in the model number denotes that this is a Floppy-Interface drive. Rather than using an expensive, dedicated controller card or SCSI interface, it piggbacks directly off your PC's standard 34-pin Floppy Disk Controller (FDC).
How it Connects:
To install it in a vintage machine, you typically use a specialized "twist" floppy ribbon cable with an extra connector:
- One end plugs into the motherboard's FDC.
- The middle/end connectors route to your standard A: or B: floppy drives.
- The tape drive slots into the chain.
Because it shares the FDC, it uses standard floppy resources (typically IRQ 6 and DMA Channel 2).
The Big Performance Catch: Because it runs off the floppy controller, data transfer speeds are heavily limited by the FDC's clock rate. On an older PC with a standard 500 Kbps controller, backing up 400 MB of data could easily take well over an hour.
🛠 Software Compatibility & Modern Use
If you are trying to get this drive running on a vintage setup or data recovery rig, keep these parameters in mind:
- Operating Systems: It is natively compatible with DOS, Windows 3.1x, Windows 95/98, and NetWare. It does not have native support in modern 64-bit operating systems.
- Backup Software: To talk to the drive, you generally need period-accurate software that supports QIC-80 floppy tape drives, such as:
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- Mountain FileSafe software
- Conner Backup Exec (or early Seagate Backup Exec versions)
- Colorado Backup
- The built-in "Microsoft Backup" utility found in Windows 95.
- The "Drive B:" Conflict: Some motherboard BIOS setups require you to configure the floppy controller to expect a tape drive, or you may have to disable your physical "Drive B:" floppy drive because the tape drive intercepts that select signal to function.
Specifications: As per Google search E&OE
