EIDE HD Parameters and BIOS settings mismatch?


I recently bought a WD Expert 27GB UDMA/66 hard drive for use in my system (Asus P2B-S, with the latest BIOS version).

Upon installing it, the BIOS seems to detect the drive just fine, and the reported size matches.  However, checking WD's site, the drive parameters listed on the site do not match that with the BIOS settings.

According to WD, the parameters are:

Cylinders 16383
Heads 16
Sectors 63
...

But all the available settings in the BIOS have an incorrect cylinder setting, though in at least one setting I think the Head and Sectors match the WD specs.

I can't seem to enter the settings in manually, either.

Is this something to be concerned about?

Again, the size begin reported is correct in all the available settings.


Thanks,

AP9
ap9Asked:
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ggilmanCommented:
I wouldn't worry about it. I've had this happen before and never had a problem. Since the size matches, you should be fine. One thing though, you can probably manually set the settings if it bothers you. Normally one of the dirve types you can choose is a manually set type where you enter that info in.
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ap9Author Commented:
Well, as it turns out, if I set the info manually (had to cycle to a certain user-defined mode, as well as drive type) the size comes out wrong.  Then my machine froze and I had to reboot.

I guess my main concern is, will I damage the drive if the BIOS setting is incorrect (and ends up having an effect, which it shouldn't, according to what you said).

BTW, is it safe to set S.M.A.R.T. enabled in the BIOS?  I also have an IBM 9GB SCSI drive (non-SMART, is my guess) that is currently the bootable drive.  Will the BIOS SMART setting only affect the WD (which is SMART capable, it seems)?

Thanks,

AP9
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cumboCommented:
ap9,

Don't worry about the cylinder setting being wrong so long as capacity is correct. So far as the SMART setting is concerned it will not affect the SCSI drive.

The SCSI drive is administered and controlled via the SCSI controller BIOS not the computer BIOS.

Cumbo
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ap9Author Commented:
Ah, ok.  Thanks.

That being the case (and this is just for my own enlightenment), what purpose does the BIOS parameters serve, if the numbers don't have to match the specs?


AP9
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cumboCommented:
The BIOS reads the info from the drive and interprets that info as it sees it.

So long as the total size is correct the interpretation is correct. The paper that comes with the drive usually gives several cyl, sect, head parameters that can be used. In almost every case the sector and head parameters will be 63 & 16.

Cumbo
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ap9Author Commented:
Cool, thanks!  Both of you gave great answers.  Who should I credit points to?


AP9
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cumboCommented:
Give them to qqilman since he posted the first suggestion. I only embelished his comment..

Cumbo
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ap9Author Commented:
Thanks!


AP9
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ggilmanCommented:
Does that mean I get the points??
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ap9Author Commented:
Yep.  :)
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