Originally Posted by HapiROTT
Good point, But if the drive manufactures are like the CPU manufactures (refering to how they use a laser to neuter the cache size and functions on higher end chips to sell them as lower value chips) the HDD platter's have the same density and they just restrict the controllers on the platter so they can sell the same technology to a wider market. The new ones anyway.
I'm not sure exactly what you're saying there and how it applies to the decision to get 5400 or 7200 RPM.
I looked up the specifications of the 5400 RPM Travelstar drive that came in my new E1505.http://www.hitachigst.com/hdd/support/5k100/5k100.htm
In that line of drives the 40, 60 and 80 GB drives all have the same areal density. The difference is they use 2, 3, or 4 disk surfaces for storage (with the 40 GB 2 surface drive having only one platter instead of two). They also had a 100 GB drive in the same series using two platters and 4 surfaces for recording. That drive did have a higher areal density, and presumably a higher maximum transfer rate.
All that is fairly straight forward. I don't think any of that qualifies as playing tricks with the controller. However, at the bottom of the page is this note:
"Part numbers 0A25825 and 0A25826 and other special bid parts are 5400 RPM drives with 4200 RPM emulation mode enabled. These part numbers are designed for applications where 4200 RPM performance is desired."
Is that the sort of thing you meant? I would agree that that is playing tricks with the controller, and deliberately crippling a product to sell it to a cheaper market segment.