# Hardware

## General discussion

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### Formula for HD size????

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Is there a "simple" formula for distinguishing the size of a hard drive by information normally given on the "tag" of a Hard Drive. I've heard of a quick and easy way to determine this but I just can't seem to remember the formula or where I remember reading about it.

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by In reply to Formula for HD size????

drives are organized by tracks, cylinders and sectors. So assuming for sake of arguement there are 16 heads (cylinders) and 160 tracks x 18 sectors each and 1 sector holds 512 bytes the geometry becomes 16x160x18x512 == ~23gb unformated space. You will loose some actual space once it is formated. Another way is to pick-up pocket pc-ref by Thomas J glover or millie M Young and look your drive up in it. Another way is to check the drive out on the manufacturers web site.

regards
rick

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by In reply to Formula for HD size????

Yes, there is. It is in the Model name. But it is not that simple.

Western Digital:
A typical model might be WD400BB or AC33200. In the first example, the 400 means 40.0GB, the last digit being a fraction of GB. In the second, the 3200, ignoring the 3 after AC, means 3200 MB or 3.2GB, the last digit being a MB.

Maxtor:
A model might be 52049H. This is 2049MB or 20.49GB HD ignoring the first digit. I have a model 4R080J0 and this is 80GB not 80MB.

Seagate:
A model might be ST34313A. The 3431, ignoring the 3 after ST, means 4313MB or 4.3GB. There are exceptions. A model ST94011A is not 4.0GB but 40GB.

Fujitsu
A model MPE3084AE is an 8.4GB HD and MPE3173AE a 17.3GB.

So there is not a uniform formula. The formula is based on the model series. If you need more information, visit each of the manufacturer?s website.

2 total posts (Page 1 of 1)

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