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Toshiba 120GB MK1234GSX SATA Hard Drive Review
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The Toshiba MK1234GSX

The top plate of the Toshiba 120GB MK1234GSX hard drive is adorned with a single label, listing its capacity, model number, serial number and other details. If it wasn't for the label, you wouldn't even know it harbours a capacity of 120GB!

As you can also see on the label, this hard drive was manufactured in Japan, although it probably contains components sourced from other countries.

Top : Drive label
Leftmost : Top plate
Left : Underside

Except for the PCB, the underside is completely bare. Even the PCB is devoid of any surface-mounted components as this is necessary for the drive to fit within the narrow confines of a notebook hard drive bay.

Here are the other views of the Toshiba MK1234GSX hard drive. As you can see, it looks just like any other 2.5" hard drives.

Left view

Right view

Front view

Back view

We then removed the PCB. This what the hard drive looks like without the PCB. A black, paper-like sheet separates the PCB from the drive's underside. You can also see the contact points for the PCB (see below).

Underside, without the PCB

The PCB, with its cover


Now, let's take a look at the drive's specifications!




• MK1234GSX

Formatted Capacity

• 120 GB

Bytes Per Sector

• 512 bytes

Sectors Per Track



• 79,056



Read/Write Heads


Recording Method

• NA

Spindle Speed

• 5,400 RPM

Average Latency

• NA

Average Seek

• 12 msec.

Internal Data Transfer Rate

244.7 to 474.7 Mbits/s
30.6 to 59.3 MB/s

Maximum I/O Data Transfer Rate

• 150 MB/s

Spin Up Time

• 3.5 s (Typical)
• 9.5 s (Maximum)

Recovery Time (from Standby)

• 3.5 s (Typical)
• 9.5 s (Maximum)

Supported Interfaces

• ATA-7
• Serial ATA 1.0a
• Serial ATA II 1.2

Cache Buffer


Maximum Height

• 9.5 mm
• 0.374 inches

Maximum Width

• 69.85 mm
• 2.75 inches

Maximum Length

• 100 mm
• 3.945 inches

Maximum Weight

• 102 g
• 0.22 lb

Typical Startup Power (peak)

• 4.5 W

Seek Power (Typical)

• 2.5 W

Operating Power (Typical)

• Read : 2.0 W
• Write : 2.0 W

Idle Mode (Typical)

• 0.8 W

Standby Mode (Typical)

• 0.25 W

Ambient Temperature

• 5 °C to 55 °C (Operating)
• -20 °C to 60 °C (Non-Operating)

Maximum Operating Shock
(@ 2 msec.)

• 325 G

Maximum Non-Operating Shock
(@ 1 msec.)

• 850 G

Idle Drive Acoustics

• 25 dB (Maximum)

Random Seek Drive Acoustics

• 27 dB (Maximum)

Head Rest Method

• Ramp Load

Load/Unload Cycles

• NA

Non-Recoverable Read Errors

• 1 error per 1013 bits read

Now, let's take an in-depth look at the drive and its various features and components!


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