Re: 28-bit LBA BIOS and 48-bit LBA XP - Can I use my 160GB hard disk safely?
- From: John John <audetweld@xxxxxxxxxxx>
- Date: Fri, 31 Aug 2007 14:24:20 -0300
I have never heard of that. Like Ken said in his post, without both requirements Windows should not, or will not, properly see all the disk space. Maybe your BIOS is 48-bit LBA aware, maybe you have a setting in the BIOS that isn't quite right but that doesn't affect Windows... I just don't know what is going on with your pc.
John
JS wrote:
However, I met cases that sometimes BIOS cannot recognize a disk but it
appears in Windows. I don't know if you also have such experiences. So,
somehow Windows can see disks beyond BIOS, though I don't know how/why.
"John John" <audetweld@xxxxxxxxxxx> wrote in message
news:OYKXZ0%236HHA.4304@xxxxxxxxxxxxxxxxxxxxxxx
I wouldn't trust it and to tell you the honest truth I don't know how
Windows can properly see all of your disk if the BIOS cannot see it. There
are two necessities or requirements for Windows XP to properly identify and
use hard disks larger than 137GB. One is that you have at least SP1
installed and the other is that the BIOS be 48-bit LBA aware. I have never
heard of one working without the other. The only way around the BIOS
requirements would be to place the disk on an independent third party
controller. I'm not sure what is going on with your pc and why it seems to
defy the above 2 requirements.
John
JS wrote:
That's not what I ask. I know how to partition disk. Auctually I already
partitioned this disk. My worry is whether my 28-bit LBA BIOS will screw
up my data.
"Rich Barry" <rbarry@xxxxxxxxxxxx> wrote in message
news:46d75b45$0$32469$4c368faf@xxxxxxxxxxxxxxxxx
Rt Click MyComputer>select Manage>Storage>Disk Management. Rt click
the Unallocated Space and select create Logical Partition (drive). That
should take care of
the remaining Drive Space. You will wind up with two partitions C: and
D:
"JS" <J@S> wrote in message news:Od5xiX16HHA.4816@xxxxxxxxxxxxxxxxxxxxxxx
I recently upgraded my notebook with a 160GB hard disk. However in BIOS
I see only 137GB. I know it is because the BIOS is only so-called
'28bit' LBA. The notebook is of 4 years old and there will be no more
BIOS update.
When I install XP (SP2) on this HD, I still see 160GB in XP. I heard it
is because the driver in XP SP2 (atapi.sys) is 48-bit LBA already so it
can recognize and access all 160GB disk.
But does this mean I can ignore the BIOS limitation and fully utilize
160GB in XP? I also heard some people with similar HD upgrade suffered
data loss or system destruction because as something in the system
doesn't support 48-bit, when writing to disk, it wraps back to first
tracks and destroys MBR, boot sectors etc. But I don't know whether it
was because BIOS didn't support 48-bit.
So my question is, with 28-bit BIOS, can I safely use 160GB disk with XP
Sp2?
I read many articles, including Microsoft ones, that state that besides
the OS 48-bit LBA support, BIOS must also support 48-bit LBA. But I also
heard that, BIOS is only active when booting up the PC, once it passes
to OS, it should be the OS that manages the disk. So, even though in
BIOS I see only 137GB, it should not affect OS activities as long as OS
supports 48-bit LBA. So I am a bit confused: As OS can recognize 160GB,
why BIOS matters? In what situation can a 28-bit LBA BIOS destroy a
160GB disk?
I heard that some people say 'as long as the midpoint of the partition
falls below 137GB, the BIOS will be able to boot from that partition'
because the midpoint is where the MFT mirror is stored. But in XP the
MFT mirror is stored at the end of partition?
.
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