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Silver rectangular 2.5 inch bare laptop hard drive

Seagate

Seagate Momentus 4200.2 ST9100822A 100GB 4200 RPM 8MB Cache IDE 2.5" laptop hard drive

SKU CH-9C40-CRCVF MPN ST9100822A

100 GB 2.5" IDE laptop drive with 4200 RPM, 8 MB cache and FDB 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
  • 100GB capacity stores large media libraries and applications
  • 4200 RPM spindle delivers quiet operation for notebook use
  • 8MB cache reduces average seek time to 12.5ms
  • IDE Ultra ATA100 interface fits legacy laptop bays
  • FDB motor technology extends bearing life in 2.5" form factor

100GB IDE 2.5" Laptop Drive

The Seagate Momentus 4200.2 ST9100822A is a 100GB internal hard drive built for 2.5-inch laptop bays. It spins at 4200 RPM with an 8MB cache and connects via an IDE Ultra ATA100 / ATA-6 interface. The bare drive uses FDB technology and SecureConnect features. It is supplied new without accessories.

Suits legacy IDE systems only

This drive fits notebooks and industrial equipment that require a parallel ATA connection and a 2.5-inch form factor. Buyers needing a Serial ATA interface, higher spindle speeds, or larger capacities should look at something else. The 4200 RPM rating and 12.5ms seek time reflect the original design specification.

IDE Ultra ATA100 interface decides fit

The single specification that determines compatibility is the IDE Ultra ATA100 / ATA-6 interface. Verify the host system uses this exact parallel ATA standard before purchase. No other connector or protocol is supported by 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 $101.99
Pricier than about 66% 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 $1,019.90 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 4200.2
Model nameST9100822A
Total capacity100 GB
Performance
Average seek time12.5 ms
Mean latency5.6 ms
Rotational speed4,200 RPM
Storage
Cache memory8 MB
Ports & slots
Interface typeIDE Ultra ATA100 / ATA-6
Size & build
Form factor2.5 in (6.35 cm)
Shipping weight0.24 kg
Package size102 × 51 × 25 mm

Questions about this item

What comes with the bare-drive ST9100822A and what must I buy separately?

The box contains only the 2.5-inch 100GB drive itself. You will need to supply mounting screws, an IDE cable if the laptop lacks one, and any operating-system media.

How do I decide between the Momentus 4200.2 versions when the cache and RPM look identical?

All 4200.2 drives share 4200 RPM and 8MB cache; choose by capacity — this model is the 100GB variant — and confirm the laptop accepts IDE Ultra ATA100.

What does the 12.5 ms average seek time mean once the drive is installed?

It is the typical delay for the heads to reach a track; combined with 5.6 ms latency at 4200 RPM, it sets the baseline random-access speed for the 100GB capacity.

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