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Hard disk--Translation?

By wenyahu ·
I am reading NTW resouce kit on page 556 "Translation is the conversion of physical disk geometry(the number of cylinders on the disk, number of heads per cylinder, and sectors per track) to a logical configuration that is compatible with the operating system" What this mean of "a logical configuration that is compatible with the OS"?

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Hard disk--Translation?

by McKayTech In reply to Hard disk--Translation?

In order to locate pieces of data on a hard drive, the OS uses some sort of addressing scheme to uniquely identify each cluster or piece of data. This addressing scheme may include address counters as well as tables of various sorts.

As regards the addressing scheme, a logical configuration would be compatible if it allowed all address counters to remain within their design ranges. For example, if an OS used a 16-bit address counter, it could only address 65,535 clusters and the hard drivewould have to be organized with that many clusters or less. Each cluster would then be the drive size divided by the number of clusters. This type of limitation is why there have been various drive size limitations (528meg, 2.1gig, 4gig, etc.) as DOS and Windows have evolved.

Logical compatibility might also involve making sure the boot records are on track 0 and that sort of thing.

The key concept is that translation is what happens when the OS requests cluster number 65,236 and the disk system delivers the contents of cylinder 1015, sectors 48-63.

paul

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Hard disk--Translation?

by wenyahu In reply to Hard disk--Translation?

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by shmaltz In reply to Hard disk--Translation?

It means that what ever OS you are using the OS is taking all the properties said (the cylinders heads sectors) and translates it to you the user (and all the programs accessing the HD thru that OS) into a logical format that you understand, so whenyou work with the HD you dont work with a sector or cylinder (although you can do that if you want thru debug or any other program that lets you do that) instead you work with properties of the HD that the OS gives you, in Windows its a cluster.
Thats what you do when you format a HD you create that logical configuration of the HD.
HD = Hard Drive
Properties = the objects that make out the parent object you are talking about, in this case the parent object is the HD and the properties is thecylinders sectors heads.

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by wenyahu In reply to Hard disk--Translation?

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