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Silver rectangular 2.5 inch bare laptop hard drive

Seagate

Seagate Momentus 5400.2 ST9100823A 100GB 5400 RPM 8MB Cache IDE 2.5" laptop hard drive

SKU CH-NEQK-5NY9S MPN ST9100823A

100 GB 2.5-inch IDE laptop drive with 5400 RPM speed, 8 MB cache, 12.5 ms seek time and QuietStep ramp-load technology

  • Total capacity100 GB
  • Interface typeIDE Ultra ATA100 / ATA-6
  • Form factor2.5 in (6.35 cm)
  • Packaging typeBare Drive
  • Cache memory8 MB
  • Average seek time12.5 ms
  • 100 GB capacity stores large media libraries and backups
  • 5400 RPM spindle speed delivers steady throughput for everyday tasks
  • 8 MB cache buffer accelerates frequent read and write operations
  • 5 inch 9.5 mm form factor fits standard laptop drive bays
  • QuietStep ramp load technology reduces acoustic noise during head parking

New 100GB IDE laptop drive

This Seagate Momentus 5400.2 model ST9100823A is a new 2.5 inch internal hard drive with 100GB capacity. It spins at 5400 RPM and uses an IDE Ultra ATA100 / ATA-6 interface with an 8MB cache buffer. The bare drive measures 9.5mm in height and includes QuietStep ramp load technology with a SoftSonic FDB motor.

Suits legacy IDE upgrades only

This drive fits notebooks that accept a 2.5 inch IDE Ultra ATA100 / ATA-6 device with 9.5mm clearance. Buyers whose systems require a different interface or a larger capacity should look elsewhere. The 5400 RPM speed and 12.5ms average seek time match typical period-correct replacement needs.

IDE Ultra ATA100 / ATA-6 interface

The single specification that decides compatibility is the IDE Ultra ATA100 / ATA-6 connection. Verify that the host machine supports this exact interface before purchase. No other interface is present on this model.

How it compares

Measured against everything we stock in 2.5-Inch Internal Laptop HDDs, at today’s prices. Recalculated every night.

Price $136.99
Pricier than about 75% of the 645 comparable items (median $66.99).
Total capacity 100 GB
Lower than about 87% of the 419 comparable items (median 320 GB).
Price per TB $1,369.90 per TB
Pricier than about 90% of the 416 comparable items (median $233.48 per TB).

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Specifications

Product
Brand nameSeagate
Product lineMomentus 5400.2
Model nameST9100823A
Total capacity100 GB
Performance
Average seek time12.5 ms
Mean latency5.6 ms
Rotational speed5,400 RPM
Storage
Cache memory8 MB
Ports & slots
Interface typeIDE Ultra ATA100 / ATA-6
Size & build
Form factor2.5 in (6.35 cm)
Max height9.5 mm
Shipping weight0.45 kg
Package size102 × 51 × 25 mm

Questions about this item

How do I install the 2.5" IDE drive and set the master or slave jumper correctly?

Insert the 9.5 mm high drive into the laptop bay, connect the 44-pin IDE cable, and set the jumper block to master for a single drive or cable-select if the system requires it.

What maintenance will the SoftSonic FDB motor and QuietStep ramp load mechanism need over time?

No scheduled maintenance is required; the fluid-dynamic bearing motor and ramp-load design are sealed for the life of the 100 GB drive.

At what point does the 8 MB cache become the bottleneck during sustained transfers?

The 8 MB buffer fills quickly on large sequential writes at the Ultra ATA 100 interface, so sustained throughput drops to the 5400 RPM media rate once the cache is exhausted.

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