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01/16/2004 at 05:23PM PST, ID: 20853588
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5.4

BIOS - Hard Disk setup

Asked by dbrckovi in Miscellaneous Hardware

Tags: bios

Hi.

I have 3 questions regarding hard disk detection.

1)
When I enter BIOS/Standard Cmos Setup I get the table where I can setup the detection mode for my hard disks.
Can someone tell me what does the following mean:

SIZE, CYLS, HEAD, PRECOMP, LANDZ, SECTOR, MODE ( NORMAL, LBA, LARGE )

I would also like to know what does the value for each of theese items represent, and how is it connected with another values and the disk they represent?
I noticed I can't directly change the SIZE value, so what is the formula to calculate the size.

2) What does the info on my hard disk's label represent:                   Bytes Per Sector/Block = 510
                                                                                                    Logical CHS = 16383/16/63       ( Is this a shortcut for Cylinders, Head, Sector ?)
                                                                                                    LBA = 80293248 Sectors           ( How is this connected with LBA mode in BIOS?)

3) And now the main reason I ask this Q.

I have bought a new disk today, hoping to replace my old one which died yesterday, but BIOS won't recognize it.
It's capacity is 40 GB, and old one's was 20 GB.

I think the problem is that my BIOS is not capable to detect disks larger than 32 GB.
I suspect this becouse I tried messing around with values in BIOS/Standard Cmos Setup trying to get the size to 40 GB (just to se if it can go so high), and it seems it can't.
It drops back to 0 when CYLS value reaches 65536 (when value is 65535, SIZE is somewhere around 32000).

This is when MODE value is set to NORMAL. When it is set to LBA or LARGE, size remains somewhere near where it was, but other values change, and are no longer changable.

My question is. Is there a way I can make my disk work with my computer? Can I  fool my BIOS somehow to think it has 32 GB disk?

If it's somehow usefull, I have PII - 400, 256 MB RAM.



Thanks
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Zone: Miscellaneous Hardware
Tags: bios
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Solution Provided By: sirbounty
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