11-30-2003, 04:55 AM
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Hard Drive Recognition
I have an 82Gig IBM Deskstar on Primary Master that only comes up as a 4.5Gig in the BIOS, but XP loads on it as a full 80Gig. When it's then put on Primary Slave, it's shown as 4.5Gig Unknown File System in Disk management. I've tried the Disk Fitness Tool (comes up as 80Gig) and erased the whole thing including the boot sector, but it still shows as 4.5Gig when reinstalled. Any thoughts as to how I can get it as 80Gig?
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11-30-2003, 04:59 AM
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Location: Conisbrough, Yorkshire. England
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How have you set your drive in BIOS ...
Auto Detect?
Manual Setting?
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11-30-2003, 05:09 AM
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everything's on AUTO. I've an identical drive (they were used as a Mirror Raid setup before my MoBo went awol, lol) that's detected fine
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11-30-2003, 05:16 AM
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Try going into BIOS and setting up the drive manually, all the parameters are (normally) printed on the drive.
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11-30-2003, 05:56 AM
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copied the settings of the working drive into the bios for the problem one. Booted ok, disk manager still showed 4.5Gig, rebooted into bios and settings had reverted back to low reading, even though the detect was still set as manual! Is this odd or what?
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11-30-2003, 06:07 AM
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Breaking News
put the drive onto another mobo, only saw it as 4.5Gig. Loaded XP on it OK, put it back on full rig where it appeared as 82Gig, 4.5Gig formatted. Am I missing an important something here?
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11-30-2003, 06:17 AM
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This is starting to get confusing please confirm ...
The OS sees the HDD as 80GB?
BIOS Auto sees the HDD as 4.5 GB?
BIOS manual settings* see the HDD as 4.5 GB?
* You need to take the parameters from the actual drive!
Remember the BIOS does not care about the formatted size of the HDD.
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11-30-2003, 06:29 AM
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the writing on the disk is
LBA:160.836.480 SECTORS CHS:16383/16/63
From this I presume it's
CYLINDERS = 16383
HEADS = 16
(landing = 16382)
SECTORS = 63
the working disk showed
CYLENDERS = 39420
HEADS = 16
(landing = 39419)
SECTORS = 255
How come the BIOS reset itself when rebooted? Is this going to happen when I put in these values?
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11-30-2003, 06:54 AM
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put in values, came up with "NTLDR is missing - press any key to restart" BIOS changed itself back to 4.5Gig settings (still on manual). Is there a way to COMPLETLEY wipe ALL the info off the drive to the point of a new drive? Or a CMOS reset type command?
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11-30-2003, 07:02 AM
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Firstly they are not identical drives if the parameters are different!
What is the model number on the problem drive?
Forget about the Format of the drive until the BIOS has correctly identified it.
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11-30-2003, 07:06 AM
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To put your drive back to factory settings use one of the tools on this page Hitachi (Hitachi is the page you are directed to from the IBM site)
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11-30-2003, 07:12 AM
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they're identical IBM Deskstar 82.3GB units, model IC35L080AVVA07-0. This is picked up during the primary bus scan. The 16383/16/63 is the number printed on the outsides, while the 39420/16/255 is the AUTO DETECT setting on the working drive.
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11-30-2003, 07:14 AM
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That Hitachi Drive Fitness Tool is the one I'm using to zero the MBR. It sees it as 82.3GB but it still comes out as 4.5GB.
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11-30-2003, 07:42 AM
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What are the parameters picked up by the BIOS (Auto settings) on the problem drive?
The BIOS can only work using information given by the drive (Auto) or by punching in the parameters (Manual).
It is not interested in the formatted size of the drive.
If the BIOS can only see 4.5 GB something is telling it the size is 4.5 GB (Either the drive is reporting incorrectly or you have punched in the wrong parameters).
The MBR and ALL the formatted portion(s) of the drive are set by the OS not BIOS.
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11-30-2003, 08:14 AM
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dodgey drive is
4832 MB
CYLINDERS = 9362
HEADS = 16
SECTORS = 63
The bios keeps resetting to these values even when Manual entries (the other drive settings - the printed information) are put in.
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