If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. |
|
|
Thread Tools | Display Modes |
#1
|
|||
|
|||
48 bit LBA question
Alon Brodski wrote: Hello! I've read that HD's over 137 GB that are being installed in a system that lacks the supporting BIOS,BUT does the OS's support for large disks (i.e. Windows XP SP1 or later) can be partitioned as a single partiotion and accessed by the OS,regardless of BIOS inability to access disks' full capacity. Does it mean it's normal and therefore there's no need to upgrade the BIOS as well? What's the difference then between the system that has BOTH BIOS and OS support for large drives and the system that only has OS's support? Alon Not perfectly sure of the question but the limiting factor in how large a partition can be is determined by the OS and not the bios that allows large partitions. The example of this is Windows 2000 where a manual edit of the Windows Registry is requierd to allow partitions greater than 137 GB. Once this was done, drive partitions beyond 137 GB in large drives were allowed. |
Ads |
#2
|
|||
|
|||
48 bit LBA question
You've been doing some funny reading.
If the bios doesnt support large hd's, win wont see the full size. Some years ago some hd manu supplied utilities/software drivers to enable a 'larger' hd support, but I believe that was in the days of win9* when hd's were typically 10gb. In order to have large disk support both the bios and a winnt based o/s must support it If the bios supports large hd's (+137) and you install a pre sp winnt based o/s in that you can only initially format 137gb, then you update win to include large disk support, thereby Disk Management will see the extra spare space, and you subsequently partition that spare space, there is a theoretical possibility of corruption. "Alon Brodski" wrote in message ... Hello! I've read that HD's over 137 GB that are being installed in a system that lacks the supporting BIOS,BUT does the OS's support for large disks (i.e. Windows XP SP1 or later) can be partitioned as a single partiotion and accessed by the OS,regardless of BIOS inability to access disks' full capacity. Does it mean it's normal and therefore there's no need to upgrade the BIOS as well? What's the difference then between the system that has BOTH BIOS and OS support for large drives and the system that only has OS's support? Alon |
#3
|
|||
|
|||
48 bit LBA question
Hello!
I've read that HD's over 137 GB that are being installed in a system that lacks the supporting BIOS,BUT does the OS's support for large disks (i.e. Windows XP SP1 or later) can be partitioned as a single partiotion and accessed by the OS,regardless of BIOS inability to access disks' full capacity. Does it mean it's normal and therefore there's no need to upgrade the BIOS as well? What's the difference then between the system that has BOTH BIOS and OS support for large drives and the system that only has OS's support? Alon |
#4
|
|||
|
|||
48 bit LBA question
Both the OS and the BIOS must have support for large drives (48 Bit LBA). If
your PC hardware/bios does not support 48Bit LBA then you will need a PCI card (see Promise Tech: http://www.promise.com/ ) to support drives larger than about 137GB. You can test your PC's drive interface to see if it supports 48Bit LBA using a tool named HD Tune. http://www.hdtune.com/ Also see MS article: http://support.microsoft.com/default...&Product=winxp JS "Alon Brodski" wrote in message ... Hello! I've read that HD's over 137 GB that are being installed in a system that lacks the supporting BIOS,BUT does the OS's support for large disks (i.e. Windows XP SP1 or later) can be partitioned as a single partiotion and accessed by the OS,regardless of BIOS inability to access disks' full capacity. Does it mean it's normal and therefore there's no need to upgrade the BIOS as well? What's the difference then between the system that has BOTH BIOS and OS support for large drives and the system that only has OS's support? Alon |
#5
|
|||
|
|||
48 bit LBA question
Well the funny reading occurred at this group a few months ago. No digress
or challenging remarks were made by MVPs, or others that frequent with replies, to that remark made many times here. I did laugh abit when I read it a few times. Some inconsistencies remain unchecked here. And may be proliferated by silence. -- Jonny "DL" address@invalid wrote in message ... You've been doing some funny reading. If the bios doesnt support large hd's, win wont see the full size. Some years ago some hd manu supplied utilities/software drivers to enable a 'larger' hd support, but I believe that was in the days of win9* when hd's were typically 10gb. In order to have large disk support both the bios and a winnt based o/s must support it If the bios supports large hd's (+137) and you install a pre sp winnt based o/s in that you can only initially format 137gb, then you update win to include large disk support, thereby Disk Management will see the extra spare space, and you subsequently partition that spare space, there is a theoretical possibility of corruption. "Alon Brodski" wrote in message ... Hello! I've read that HD's over 137 GB that are being installed in a system that lacks the supporting BIOS,BUT does the OS's support for large disks (i.e. Windows XP SP1 or later) can be partitioned as a single partiotion and accessed by the OS,regardless of BIOS inability to access disks' full capacity. Does it mean it's normal and therefore there's no need to upgrade the BIOS as well? What's the difference then between the system that has BOTH BIOS and OS support for large drives and the system that only has OS's support? Alon |
#6
|
|||
|
|||
48 bit LBA question
On Fri, 25 Aug 2006 02:21:07 +0200, "Alon Brodski"
wrote: Hello! I've read that HD's over 137 GB that are being installed in a system that lacks the supporting BIOS,BUT does the OS's support for large disks (i.e. Windows XP SP1 or later) can be partitioned as a single partiotion and accessed by the OS,regardless of BIOS inability to access disks' full capacity. An indication that the BIOS is not critical is seen during installation of Windows XP: 1. Windows XP CD sans SP1 or SP2 setup program recognizes only 131000 MB of a large disk, even if the BIOS sees the entire disk. 2. Windows XP CD incorporating SP1 or SP2 setup program recognizes the entire large disk, even if the BIOS does not. This means the Windows XP setup program does not use the BIOS to partition and format the disk. You can easily see this for yourself if you have the appropriate hardware and software. Once Windows XP is booted and running, the CPU runs in protected mode and is not able to run BIOS code. Does it mean it's normal and therefore there's no need to upgrade the BIOS as well? You only need to upgrade the BIOS if the existing BIOS is preventing you from doing something that the new BIOS would allow. What's the difference then between the system that has BOTH BIOS and OS support for large drives and the system that only has OS's support? A BIOS that can access large disks allows: 1. booting from a partition that crosses the 137 GB point on the disk drive. 2. using software that uses the BIOS to access the disk drives to fully access disks larger than 137 GB (e.g., running Partition Magic in DOS mode). Alon |
#7
|
|||
|
|||
48 bit LBA question
As a matter of fact,the "funny reading" was from Scott Mueller's book 17th
ed. I just never heard myself that it's possible to bypass the BIOS,though I know that XP has direct access to hardware without BIOS's help.So I guess the same thing happens with large disks recognition. Though some people here say it's impossible,so I guess the only way is to try myself ;-) Though I really don't feel like buying large PATA HD....SATA won't run in old PC and with SATA-150 PCI card the BIOS issue would be solved to begin with...Catch-22 :-) From what I understood until now ,even if OS would see all the large disk,without BIOS upgrade it can't be a bootable disk (if partitioned as a single volume)? If so...I don't need a system without BIOS,'cos I like single partition that is bootable (C. I don't think using a Partition Magic is a good idea.Extra headache +expense. "Andy" wrote in message ... On Fri, 25 Aug 2006 02:21:07 +0200, "Alon Brodski" wrote: Hello! I've read that HD's over 137 GB that are being installed in a system that lacks the supporting BIOS,BUT does the OS's support for large disks (i.e. Windows XP SP1 or later) can be partitioned as a single partiotion and accessed by the OS,regardless of BIOS inability to access disks' full capacity. An indication that the BIOS is not critical is seen during installation of Windows XP: 1. Windows XP CD sans SP1 or SP2 setup program recognizes only 131000 MB of a large disk, even if the BIOS sees the entire disk. 2. Windows XP CD incorporating SP1 or SP2 setup program recognizes the entire large disk, even if the BIOS does not. This means the Windows XP setup program does not use the BIOS to partition and format the disk. You can easily see this for yourself if you have the appropriate hardware and software. Once Windows XP is booted and running, the CPU runs in protected mode and is not able to run BIOS code. Does it mean it's normal and therefore there's no need to upgrade the BIOS as well? You only need to upgrade the BIOS if the existing BIOS is preventing you from doing something that the new BIOS would allow. What's the difference then between the system that has BOTH BIOS and OS support for large drives and the system that only has OS's support? A BIOS that can access large disks allows: 1. booting from a partition that crosses the 137 GB point on the disk drive. 2. using software that uses the BIOS to access the disk drives to fully access disks larger than 137 GB (e.g., running Partition Magic in DOS mode). Alon |
#8
|
|||
|
|||
48 bit LBA question
On Fri, 25 Aug 2006 20:40:42 +0200, "Alon Brodski"
wrote: As a matter of fact,the "funny reading" was from Scott Mueller's book 17th ed. I just never heard myself that it's possible to bypass the BIOS,though I know that XP has direct access to hardware without BIOS's help.So I guess the same thing happens with large disks recognition. Though some people here say it's impossible,so I guess the only way is to try myself ;-) Though I really don't feel like buying large PATA HD....SATA won't run in old PC and with SATA-150 PCI card the BIOS issue would be solved to begin with...Catch-22 :-) From what I understood until now ,even if OS would see all the large disk,without BIOS upgrade it can't be a bootable disk (if partitioned as a single volume)? If so...I don't need a system without BIOS,'cos I like single partition that is bootable (C. A BIOS that has the 137 GB limitation is actually able to boot a single partition on a 250 GB disk drive. As long as Windows is installed in an empty partition, the highest point on the disk that has to be accessed during booting is the NTFS master file table, which is located at the midpoint (~ 125 GB) of the partition, well below the limitation. I don't think using a Partition Magic is a good idea.Extra headache +expense. "Andy" wrote in message .. . On Fri, 25 Aug 2006 02:21:07 +0200, "Alon Brodski" wrote: Hello! I've read that HD's over 137 GB that are being installed in a system that lacks the supporting BIOS,BUT does the OS's support for large disks (i.e. Windows XP SP1 or later) can be partitioned as a single partiotion and accessed by the OS,regardless of BIOS inability to access disks' full capacity. An indication that the BIOS is not critical is seen during installation of Windows XP: 1. Windows XP CD sans SP1 or SP2 setup program recognizes only 131000 MB of a large disk, even if the BIOS sees the entire disk. 2. Windows XP CD incorporating SP1 or SP2 setup program recognizes the entire large disk, even if the BIOS does not. This means the Windows XP setup program does not use the BIOS to partition and format the disk. You can easily see this for yourself if you have the appropriate hardware and software. Once Windows XP is booted and running, the CPU runs in protected mode and is not able to run BIOS code. Does it mean it's normal and therefore there's no need to upgrade the BIOS as well? You only need to upgrade the BIOS if the existing BIOS is preventing you from doing something that the new BIOS would allow. What's the difference then between the system that has BOTH BIOS and OS support for large drives and the system that only has OS's support? A BIOS that can access large disks allows: 1. booting from a partition that crosses the 137 GB point on the disk drive. 2. using software that uses the BIOS to access the disk drives to fully access disks larger than 137 GB (e.g., running Partition Magic in DOS mode). Alon |
Thread Tools | |
Display Modes | |
|
|