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Toshiba MK4018GAS 40GB Laptop Hard Drive

Part# 830464


Toshiba MK4018GAS 40GB Laptop Hard Drive


Toshiba MK4018GAS 40GB Laptop Hard Drive

Toshiba introduces the MK4018GAS 2.5-inch 40GB Hard Disk Drive. The MK4018GAS offers the industries highest areal density per platter, at 35.1gigabits per square inch. This new drive offers enough capacity for portable video recording and editing, with lower power consumption compared to the traditional 3.5-inch HDDs. This functionality provides ideal storage for a range of commercial and consumer notebooks, as well as non-PC applications such as PDAs, printers, copiers, GPS systems and MP3 players. The MK4018GAS is ATA-5 compliant, supporting high transfer rates of up to 100 megabytes per second.


  • 40GB capacity
  • Fluid Dynamic Bearing (FDB) motor drive
  • 9.5mm High
  • 12ms Average Seek Time
  • ATA-5 Interface
  • 100MB/sec  Transfer Rate
  • 2,048KB Buffer
  • 300,000 MTTF Hours


Data Storage Physical:
Per drive, formatted 40.0078GB
Data Heads 4
Number of Disks 2
Logical Configuration:
Heads 16
Cylinders 16,383
User Sectors/Track at zone 0 63
Logical Blocks (LBA) 78,140,160
Rotational Speed: 4,200rpm
Data Transfer Rate:
Max transfer rate to host 100MB/sec
Seek Time:
Track-to-track 3ms
Average 12ms
Maximum 24ms
Average Latency: 7.14ms


Buffer: 2,048KB
Nominal Power Requirements:
Logic +5V(5%)
Start 2.7watts
Seeking 2.6watts
Reading/Writing 2.3watts
Idle 0.9watts
Standby 0.25watts
Sleep 0.1watts
Physical & Environmental Specs
Height 0.37" (9.5mm)
Width 2.75" (69.85mm)
Depth 3.94" (100mm)
Weight: 3.457 oz (98g)
Ambient Temperature:
Operating 41 - 131F (5 to 55C)
Non-Operating -4 - 140F (-20 to 60C)
Shipping -40 - 158F (-40 to 70C)
Vibration and Shock:
Operating Vibration 9.8 m/s2 (1.0G), 5 - 500 Hz
Operating Shock 190g
Non-Operating Shock 800g
Reliability Characteristics
MTTF (Power on hours): 300,000
Preventive Maintenance: None
Error Rates:
Non-recoverable 1 in 1013 bits
Seek 1 in 106 seeks
Product Life: 5 years or 20,000 power ON hours

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