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Old 7th December 2008
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lvlamb lvlamb is offline
Real Name: Louis V. Lambrecht
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Join Date: May 2008
Location: .be
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Are you wining about a 64-bit Intel cpu ?
Check IA-64 vs. x86-64 architecture. Check for AMD compatibility.
Uf coarse, BIOS is written for either one, many BIOSes really are crappy (motherboards sold with ebough CDROM drivers to full a juke-box).

FWIW, here is one fdisk I have, only OpenBSD reads all the data, other fdisks exit normally but either write junk or >/dev/null.
Code:
# fdisk wd0
Disk: wd0	geometry: 10011/255/63 [160836480 Sectors]
Offset: 0	Signature: 0xAA55
            Starting         Ending         LBA Info:
 #: id      C   H   S -      C   H   S [       start:        size ]
-------------------------------------------------------------------------------
 0: B6      0   1  63 -   1000 254  63 [         125:    16080940 ] <Unknown ID>
*1: A6   1001   0   1 -   2000 254  63 [    16081065:    16065000 ] OpenBSD     
 2: 83   2001   0   1 -   4000 254  63 [    32146065:    32130000 ] Linux files*
 3: 05   4001   0   1 -  10010 254  63 [    64276065:    96550650 ] Extended DOS
Offset: 64276065	Signature: 0xB0D7
            Starting         Ending         LBA Info:
 #: id      C   H   S -      C   H   S [       start:        size ]
-------------------------------------------------------------------------------
 0: 94  99190  13  10 - 252985 160   5 [  1593488178:  2470725932 ] Amoeba BBT  
 1: 6D 170160 126  20 -   7322 214  30 [  2733628357:  1678980381 ] <Unknown ID>
 2: E1 129346 194  61 -  67039  52   4 [  2077955772:  3293996339 ] SpeedStor   
 3: 44 183192 158   6 -  82602 231  37 [  2942989439:  2678993577 ] <Unknown ID>
No rw errors though for the last two months, but I finally decided to run the manufacturer's tests and wipe the drive.
Problems are Intel BIOS and hard drive related.

Better fdisk with sysutils/testdisk. Not the user friendly way.
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