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Cylinders on single platter hard drives

Last response: in Storage
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October 28, 2013 4:06:03 PM

Hello everyone. I have a question regarding cylinders on a hard drive. Hard drives that have just one platter... they have cylinders? cylinders only make sense when there are at least two platters? or it has to do with the number of heads?.

Thanks.
a b G Storage
October 28, 2013 4:47:37 PM

Your definition of cylinder needs revision.

Please use these sources:
Cylinder (Hard Drive)
Cylinder Head Sector

1 platter still has many cylinders and 'tracks'.
However it should only have 2 Heads.
2 Heads per platter.

Cyclinder is SPT (sectors per track) x H (Heads)

This is typical hard drive internals many proprietary hard drives can be slightly different.
October 28, 2013 4:58:10 PM

Trent Quan-Sing said:
Your definition of cylinder needs revision.

Please use these sources:
Cylinder (Hard Drive)
Cylinder Head Sector

1 platter still has many cylinders and 'tracks'.
However it should only have 2 Heads.
2 Heads per platter.

This is typical hard drive internals many proprietary hard drives can be slightly different.


Hi, well... as I see... tracks and cylinders are not the same thing. Cylinders are three-dimensional but it has no sense when considering a single plate HD. Thanks :) 
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a b G Storage
October 28, 2013 5:03:47 PM
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Trismagia said:
Trent Quan-Sing said:
Your definition of cylinder needs revision.

Please use these sources:
Cylinder (Hard Drive)
Cylinder Head Sector

1 platter still has many cylinders and 'tracks'.
However it should only have 2 Heads.
2 Heads per platter.

This is typical hard drive internals many proprietary hard drives can be slightly different.


Hi, well... as I see... tracks and cylinders are not the same thing. Cylinders are three-dimensional but it has no sense when considering a single plate HD. Thanks :) 


I applied a small edit in my original post.

A cylinder is defined by the heads; there are 2 heads per platter.

There is a cylinder between the 2 heads only very, very thin.

Cylinder = SPT x H but of course if it were a one headed platter (unlikely) then it cant be a cylinder by definition because it is then a circle.

And even then a physicist would dispute it as a cylinder because circles only exist in a world made of 2D objects and this is real life.



Courtesy 'Wikipedia'.
!