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manually partitioning non-boot disk (save data?)
Hello,
Hopefully someone here can help me, or if there is a more suitable forum, please direct me there. I reformatted a 2nd disk (\Device\HardDisk1) that had a Linux OS on it. I was using GRUB on the 2nd Disk to choose between Linux and Windows XP, which is on my 1st disk (\Device\HardDisk0). After reformatting the Linux drive to NTFS and moving a lot of files there, I realized I would need to get Windows to boot up on its own, and after some luck, I got it to do that, but in the process I zeroed out the whole MBR that was on the 2nd disk and the partition info (where I had already reformatted to NTFS and saved a lot of files). I have MBRTOOLS which allows me to edit the partition table and the rest of the MBR for the 2nd disk, but I get an incorrect size for that disk after I boot into windows - it should be 80 Gig, but it's showing one partition at 7.88GB and then 66.65 unallocated. Aside from the size problem with the partition, *I want to save the data on the disk*, so if I get the partition entered correctly in MBRTOOLS, will I be able to access it again? If so, can someone clarify the partition settings for me. I have the following set up (obviously incorrectly). act = 00 (I think this means non-bootable) type = 7 (for NTFS ?) start CHS = 0,1,1 end CHS = 1023, 254,63 (note, when I enter 63 for Sector, the Cylinder auto decrements to 1022)?? LBA start = 63 LBA Length = auto populated at something like 16,5??,??? (sorry, forget the exact) This is Seagate's 80GB Hard drive, model ST380013A. Maybe the auto- decrementing of the Cylinder value is to blame and I need to use a tool other than MBR TOOLS Thanks in advance, Brian |
#2
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manually partitioning non-boot disk (save data?)
On 29 May 2007 03:36:31 -0700, StringChopper
wrote: Aside from the size problem with the partition, *I want to save the data on the disk*, so if I get the partition entered correctly in MBRTOOLS, will I be able to access it again? If so, can someone clarify the partition settings for me. If the data is important it might be worth doing a sector by sector copy of the entire disk to another 80GB disk before attempting anything. I have the following set up (obviously incorrectly). act = 00 (I think this means non-bootable) type = 7 (for NTFS ?) start CHS = 0,1,1 end CHS = 1023, 254,63 (note, when I enter 63 for Sector, the Cylinder auto decrements to 1022)?? LBA start = 63 LBA Length = auto populated at something like 16,5??,??? (sorry, forget the exact) NT4 (and presumably later variants) uses the LBA info rather than the CHS info so I wouldn't worry about the incorrect end CHS. It is close to the maximum possible value anyway. The LBA start looks okay. The LBA Length should be maximum LBA key for the drive (i.e. drive cyls * 255 * 63 - 1) minus 63. This value should be reduced so the volume ends at the end of a cylinder. act = 00 is non-bootable, type 7 is NTFS, so these look okay. The MBR must contain 55 AA in bytes 511, 512 (last two bytes of 512-byte sector). If you get stuck can you try to read the volume on a PC running Linux. Their NTFS driver might process the filesystem control records differently from the MS drivers and be more forgiving and let you access the data files. -- Steven |
#3
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manually partitioning non-boot disk (save data?)
On May 29, 7:04 am, Steven Saunderson wrote:
On 29 May 2007 03:36:31 -0700, StringChopper wrote: Aside from the size problem with the partition, *I want to save the data on the disk*, so if I get the partition entered correctly in MBRTOOLS, will I be able to access it again? If so, can someone clarify the partition settings for me. If the data is important it might be worth doing a sector by sector copy of the entire disk to another 80GB disk before attempting anything. I have the following set up (obviously incorrectly). act = 00 (I think this means non-bootable) type = 7 (for NTFS ?) start CHS = 0,1,1 end CHS = 1023, 254,63 (note, when I enter 63 for Sector, the Cylinder auto decrements to 1022)?? LBA start = 63 LBA Length = auto populated at something like 16,5??,??? (sorry, forget the exact) NT4 (and presumably later variants) uses the LBA info rather than the CHS info so I wouldn't worry about the incorrect end CHS. It is close to the maximum possible value anyway. The LBA start looks okay. The LBA Length should be maximum LBA key for the drive (i.e. drive cyls * 255 * 63 - 1) minus 63. This value should be reduced so the volume ends at the end of a cylinder. act = 00 is non-bootable, type 7 is NTFS, so these look okay. The MBR must contain 55 AA in bytes 511, 512 (last two bytes of 512-byte sector). If you get stuck can you try to read the volume on a PC running Linux. Their NTFS driver might process the filesystem control records differently from the MS drivers and be more forgiving and let you access the data files. -- Steven Thanks Steven, Though I had interest in setting the CHS or LBA manually - for the learning exercise, in a moment of weakness I installed partition magic which auto-corrected the start/end info. However, even after doing that, windows still wanted me to format the drive. It seems I had to make the partition "active" from within the Partition Magic Program. That worked well for my 2nd disk, but Partition Magic messed up my OS disk and now it incorrectly reads 150GB from within Windows and reads as 200+ GB in Partition Magic. It really has 160 GB. Error #109. Hopefully I can get this corrected without losing data, but since the OS is still operating, I do have the opportunity to Ghost it. Thanks again. Brian |
#4
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manually partitioning non-boot disk (save data?)
If you have re-created the damaged partition as it originally was, then I
guess it's NTFS. Windows 98 cannot access a NTFS partition, and any description of that partition you are seeing from within Windows will be meaningless. -- Jeff Richards MS MVP (Windows - Shell/User) "StringChopper" wrote in message ps.com... Hello, Hopefully someone here can help me, or if there is a more suitable forum, please direct me there. I reformatted a 2nd disk (\Device\HardDisk1) that had a Linux OS on it. I was using GRUB on the 2nd Disk to choose between Linux and Windows XP, which is on my 1st disk (\Device\HardDisk0). After reformatting the Linux drive to NTFS and moving a lot of files there, I realized I would need to get Windows to boot up on its own, and after some luck, I got it to do that, but in the process I zeroed out the whole MBR that was on the 2nd disk and the partition info (where I had already reformatted to NTFS and saved a lot of files). I have MBRTOOLS which allows me to edit the partition table and the rest of the MBR for the 2nd disk, but I get an incorrect size for that disk after I boot into windows - it should be 80 Gig, but it's showing one partition at 7.88GB and then 66.65 unallocated. Aside from the size problem with the partition, *I want to save the data on the disk*, so if I get the partition entered correctly in MBRTOOLS, will I be able to access it again? If so, can someone clarify the partition settings for me. I have the following set up (obviously incorrectly). act = 00 (I think this means non-bootable) type = 7 (for NTFS ?) start CHS = 0,1,1 end CHS = 1023, 254,63 (note, when I enter 63 for Sector, the Cylinder auto decrements to 1022)?? LBA start = 63 LBA Length = auto populated at something like 16,5??,??? (sorry, forget the exact) This is Seagate's 80GB Hard drive, model ST380013A. Maybe the auto- decrementing of the Cylinder value is to blame and I need to use a tool other than MBR TOOLS Thanks in advance, Brian |
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