The IBM 75 GXP line contains six drive models, which offer users a broad range of capacities, and price points, to choose from. Because the 75 GXP series has 15 GB platter densities, or 7.5 GB per data surface, the capacities of the various models are derived from the number of useable data surfaces that each drive has. Remembering that there are two data surfaces per platter, you can easily determine the number of platters that each model contains. Like many other manufactures, IBM offers two different drive models that incorporate two disk platters. As you can determine by reviewing the chart below, the 20 GB drive uses only three of the available 4 data surfaces, while the 30 GB drive uses all 4 data surfaces. This is why it is preferable to think in terms of usable data surfaces rather than just the number of platters.

In the following chart we have listed the entire IBM 75 GXP model line:

Model Number

Formatted Capacity

Data Surfaces / Heads


15 GB’s



20 GB’s



30 GB’s



45 GB’s



60 GB's



75 GB's


The IBM Deskstar 75 GXP product line contains drives with capacities of: 75, 60, 45, 30, 20, and 15 GB’s. All of the drives in the 75 GXP line also feature 2 MB of cache memory and 8.5 ms average seek times. The following chart lists specifications common to all of the drives in the IBM 75 GXP line:


Seek Time (Track to Track)

1.2 ms

Seek Time (Average)

8.5 ms

Seek Time (Maximum)

15 ms

Average Latency

4.17 ms

Rotational Speed

7200 RPM

Controller Overhead

< 0.3 ms

Start Time (From stop to drive ready)

15 sec

Disk Transfer (To and from interface)

100 MB/sec

Disk Transfer (To and from media)

444 Mb/sec

Buffer Size

2 MB 

Data Zones per Surface


Bytes per Sector/Block

Power Requirements/Environment
Seek 12.9 Watts
Read/Write 6.8 Watts
Idle 6.7 - 8.1 Watts*
Standby 1.4 Watts
Acoustics at Idle 3.0, 3.1, 3.6** bel
Operating Temperature 5 – 55 C

*8.1 Watts for 60 and 75 GB models, 6.7 for others.
**3.6 bel for 60 and 75 GB models, 3.1 bel for 45 GB model,
3.0 bel for 30, 20, and 15 GB models
The Drive The Test


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  • Anonymous User - Friday, September 12, 2003 - link

    It's really too bad that in the continuous ratrace of reviewing and testing new hardware, Anandtech's rarealy take the time to sit down and look back at products reviewed. In my experience the IBM 75GXP were disappointing when it came to reliability and longevity. What's the use of having the best performing harddrive if you don't know how long it will keep on working ? I just saw the replacement of my 45gig 75GXP replacement harddrive breaking down ... need I say more ? Reply

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