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750GB Hitachi 7K1000.D -- Number of platters?

post #1 of 8
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I just ordered one of these off Newegg for $100. Can anyone tell me if it's a single 750GB platter or 3 250GB platters?
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post #2 of 8
their website says 1 disc; so im assuming that means one platter
 
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post #3 of 8
Probably one. If they can make 1TB platters, then they should be able to make 750GB platters. Performance will be a bit lower since it isn't as dense.
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post #4 of 8
I'm willing to bet that the 750GB model uses 1TB platters; it's much cheaper to crank them out using the same tooling, and then make the necessary changes in the drive's firmware.

It wouldn't take much to alter the location of the start of the outer zone so that the drive becomes a 750GB unit.
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post #5 of 8
Quote:
Originally Posted by parityboy View Post

I'm willing to bet that the 750GB model uses 1TB platters; it's much cheaper to crank them out using the same tooling, and then make the necessary changes in the drive's firmware.
It wouldn't take much to alter the location of the start of the outer zone so that the drive becomes a 750GB unit.

Wonder if there's a possible platter unlock if this is true.
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post #6 of 8
Well, thinking about it, there's two ways of doing it.

a) Assuming the platters are all cut the same size, then like I said just alter the firmware so that the track zero is some ways in from the outer edge. This way you will not only get lower capacity, you will also get lower maximum sequential transfer rates, compared to the full 1TB unit.

b) Assuming the platters are all the same density, cut platters that are physically smaller, thereby yielding 750GB capacity and most likely lower maximum sequential transfer rates, compared to the 1TB unit.

Assuming technique a) is used, then theoretically you could flash it with 1TB firmware, although since the servo tracking data is actually on the platters, the real outer zones might not actually have any tracking data on them...
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post #7 of 8
Quote:
Originally Posted by HybridCore View Post

Quote:
Originally Posted by parityboy View Post

I'm willing to bet that the 750GB model uses 1TB platters; it's much cheaper to crank them out using the same tooling, and then make the necessary changes in the drive's firmware.
It wouldn't take much to alter the location of the start of the outer zone so that the drive becomes a 750GB unit.

Wonder if there's a possible platter unlock if this is true.
Not possible. People have toyed with the idea, but HDD firmware is too complicated. Even if you get it figured out for one firmware version, what about the dozens of other versions that they put out for the same model?
Quote:
Originally Posted by parityboy View Post

a) Assuming the platters are all cut the same size, then like I said just alter the firmware so that the track zero is some ways in from the outer edge. This way you will not only get lower capacity, you will also get lower maximum sequential transfer rates, compared to the full 1TB unit.
...
Assuming technique a) is used, then theoretically you could flash it with 1TB firmware, although since the servo tracking data is actually on the platters, the real outer zones might not actually have any tracking data on them...
The method used most often is Method A. However, flashing firmware from a 1TB drive is not possible. I don't know if it's because the PCBs use different chips, or because the firmware includes a lot of data specific to that drive's physical configuration, or if there's just some lock/encryption/ID that hasn't been broken - but what I do know is that people tried it in the past with other models, and it didn't work.
     
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post #8 of 8
Quote:
Originally Posted by Kramy View Post

Not possible. People have toyed with the idea, but HDD firmware is too complicated. Even if you get it figured out for one firmware version, what about the dozens of other versions that they put out for the same model?
The method used most often is Method A. However, flashing firmware from a 1TB drive is not possible. I don't know if it's because the PCBs use different chips, or because the firmware includes a lot of data specific to that drive's physical configuration, or if there's just some lock/encryption/ID that hasn't been broken - but what I do know is that people tried it in the past with other models, and it didn't work.

Thanks for crushing our hopes and dreams. tongue.gif
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