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Silver 3.5 inch internal hard drive with green circuit board and IDE connector

Seagate

Seagate ST3402111AProduct BarraCuda 7200.9 40 GB 3.5" laptop hard drive

SKU CH-NBT8-1FZN1 MPN ST3402111AProduct

A 40 GB IDE hard drive with 7200 rpm spindle speed and a 2 MB buffer for desktop storage

  • NAND Flash Memory TypeHard Drive
  • 40 GB capacity stores essential files and applications
  • 7200 rpm spindle speed delivers responsive data access
  • 2 MB buffer smooths read and write operations
  • IDE Ultra ATA/100 interface connects to legacy PC motherboards
  • 5 inch form factor fits standard desktop drive bays

40 GB BarraCuda 7200.9 IDE Hard Drive

The Seagate BarraCuda 7200.9 ST3402111A is a 40 GB internal hard drive built for desktop PCs and workstations that use the IDE Ultra ATA/100 interface. It spins at 7200 rpm with a 2 MB buffer and comes in a standard 3.5-inch form factor. The drive is supplied new and suits legacy platforms that require parallel ATA storage.

Ideal for PATA systems and legacy upgrades

This drive fits builders restoring older PCs, replacing failed drives in PATA servers or expanding storage in media PCs that only accept IDE devices. Buyers whose motherboards lack an IDE connector or who need higher capacities for modern workloads should look at alternative storage solutions.

Interface decides compatibility

The single specification that determines whether this part works is the IDE Ultra ATA/100 (ATA-6) interface; the motherboard or controller must provide a matching 40-pin IDE port for the drive to function.

Highlights

  • 40 GB capacity stores essential files and applications
  • 7200 rpm spindle speed delivers responsive data access
  • 2 MB buffer smooths read and write operations
  • IDE Ultra ATA/100 interface connects to legacy PC motherboards
  • 5 inch form factor fits standard desktop drive bays

Specifications

BrandSeagate
NAND Flash Memory TypeHard Drive

Questions about this item

How do I install the 3.5" IDE Ultra ATA/100 drive in a laptop bay?

The drive uses a 3.5-inch form factor with IDE Ultra ATA/100 interface and 1-inch height. The common mistake is assuming it fits a standard 2.5-inch laptop bay; it requires a 3.5-inch drive cage or adapter bracket and a 40-pin IDE cable with master/slave jumper set correctly.

What maintenance or replacement will the 2 MB buffer 7200 rpm mechanism need later?

The 7200 rpm spindle and 2 MB buffer are sealed; no user-serviceable parts exist. Plan replacement when SMART reallocated-sector count rises or seek noise increases, as bearing wear on this 40 GB platter is the typical end-of-life indicator.

What limit appears first during sustained writes on the IDE Ultra ATA/100 interface?

The IDE Ultra ATA/100 (ATA-6) bus caps sustained throughput at 100 MB/s, which the 7200 rpm 40 GB platters cannot saturate; the practical bottleneck is the drive's own media transfer rate, so sustained writes plateau well below the interface ceiling.

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