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{{Infobox computer peripheral
| name          = Tandon TM100-2
| image        = [[File:Tandon TM100-2 placeholder.png|260px]]
| caption      = Tandon TM100-2, full-height 5.25" double-sided 320 KB / 360 KB floppy drive
| manufacturer  = Tandon Corporation
| type          = Full-height 5.25" floppy disk drive (double-sided, 48 TPI)
| release_date  = 1982
| discontinued  = ~1987
| interface    = Shugart-style 34-pin
| compatible    = [[IBM PC (5150)]] (late units), [[IBM PC XT (5160)]], PC-compatible clones
| dimensions    = 146 mm W × 203 mm D × 82 mm H (full-height 5.25")
| weight        = ~1.6 kg
| media        = 5.25" DS DD diskette, 48 TPI, 40 tracks/side
| storage      = 320 KB (PC DOS 1.1, 8 sectors/track); 360 KB (PC DOS 2.0+, 9 sectors/track)
| predecessor  = [[Tandon TM100-1]]
| model        = TM100-2 / TM100-2A
}}
The '''Tandon TM100-2''' is a full-height 5.25" double-sided double-density (DS DD) floppy disk drive, 48 tracks-per-inch (TPI), 40 tracks per side, supplied as the standard floppy drive in most [[IBM PC (5150)]]s from late 1982 onward and in every [[IBM PC XT (5160)]] through to 1987. It stores 320 KB per disk under PC DOS 1.1 (360 KB under PC DOS 2.0+). A minor revision, the '''TM100-2A''', uses a slightly redesigned head-positioner and is functionally identical from the controller's perspective.
The '''Tandon TM100-2''' is a full-height 5.25" double-sided double-density (DS DD) floppy disk drive, 48 tracks-per-inch (TPI), 40 tracks per side, supplied as the standard floppy drive in most [[IBM PC (5150)]]s from late 1982 onward and in every [[IBM PC XT (5160)]] through to 1987. It stores 320 KB per disk under PC DOS 1.1 (360 KB under PC DOS 2.0+). A minor revision, the '''TM100-2A''', uses a slightly redesigned head-positioner and is functionally identical from the controller's perspective.


Revision as of 10:07, 21 May 2026

Tandon TM100-2
File:Tandon TM100-2 placeholder.png
Tandon TM100-2, full-height 5.25" double-sided 320 KB / 360 KB floppy drive
Manufacturer Tandon Corporation
Type Full-height 5.25" floppy disk drive (double-sided, 48 TPI)
Release date 1982
Discontinued ~1987
Interface Shugart-style 34-pin
Compatible IBM PC (5150) (late units), IBM PC XT (5160), PC-compatible clones
Dimensions 146 mm W × 203 mm D × 82 mm H (full-height 5.25")
Weight ~1.6 kg
Predecessor Tandon TM100-1
Model TM100-2 / TM100-2A
Storage 320 KB (PC DOS 1.1, 8 sectors/track); 360 KB (PC DOS 2.0+, 9 sectors/track)
Media 5.25" DS DD diskette, 48 TPI, 40 tracks/side

The Tandon TM100-2 is a full-height 5.25" double-sided double-density (DS DD) floppy disk drive, 48 tracks-per-inch (TPI), 40 tracks per side, supplied as the standard floppy drive in most IBM PC (5150)s from late 1982 onward and in every IBM PC XT (5160) through to 1987. It stores 320 KB per disk under PC DOS 1.1 (360 KB under PC DOS 2.0+). A minor revision, the TM100-2A, uses a slightly redesigned head-positioner and is functionally identical from the controller's perspective.

Specifications

  • Form factor: 5.25" full-height (1.6").
  • Heads: 2 (double-sided).
  • Tracks per inch: 48.
  • Tracks per side: 40.
  • Encoding: MFM, 250 kbit/s.
  • Unformatted capacity: 500 KB.
  • Formatted capacity: 320 KB (PC DOS 1.1, 8 sectors/track) or 360 KB (PC DOS 2.0+, 9 sectors/track).
  • Stepper motor: four-phase, 6 ms step time.

Common Faults

  • Drive belt failure — the spindle motor belt is the single most common failure on a TM100-2 today. Replacement fabric-reinforced belts are sold by Console5, Best Electronics and others.
  • Stepper grease drag — the lead screw lubricant hardens over decades. Symptom: the head carriage either does not step at all, or steps unevenly between cylinders, producing read errors that move with track number. Clean with isopropyl alcohol; re-lubricate sparingly with white lithium grease. Do not use WD-40 as a long-term lubricant.
  • Head alignment drift — after many years the heads may need re-aligning. A disk-based alignment tool (e.g. Dysan AAT) and an analog oscilloscope are required for a proper job.
  • Track 0 sensor dirty — the optical sensor that detects track 0 gets dusty and triggers false alignment errors. Clean with isopropyl alcohol on a foam swab.
  • Write-protect sensor failure — the photo-interrupter that detects the write-protect notch can drift; a permanently write-protected drive often has a dirty or failed sensor rather than a media problem.

TM100-2 vs. TM100-2A

The TM100-2A is the late-1983 revision of the TM100-2. The two share the same controller interface and capacity but differ in the head-positioner mechanism (the 2A's carriage is rigid where the 2 uses a sliding cam) and in some of the surface-mount logic. Either drive works in any 5150 or 5160 without configuration changes.

Tandon Drive Select Jumpers

The TM100-2 ships with the drive-select jumper at DS2. The IBM FDD ribbon cable has a 7-wire twist between the two drive connectors which remaps DS2 to DS0 on whichever drive sits at the end of the cable (drive A). Both drives must therefore be jumper-set to DS2 — the cable handles the remapping. The drive at the end of the cable also requires its terminating resistor pack to be present; the middle drive must have the resistor pack removed.

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