Hardware :: Lost Partition Table, "does Not End On Cylinder Boundary"?
Mar 13, 2011
While trying to get Grub working on my computer, I accidentially overwrote the partition table. Luckily I did a fdisk -l and copied the information before I did anything. The problem is that the first partition "does not end on cylinder boundary" so when I recreated the partition info using fdisk, partition 2 doesn't start in the right place and cannot be read. I have some pretty valuable data on there and I can't afford to lose it. Is there a way to create a partition that doesn't start on a cylinder boundary?
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Feb 11, 2010
I've been searching for a definitive answer/solution for this. Below are outputs from fdisk -l and a partition table listing from expert mode in fdisk. [root@ncc1701 ~]# fdisk -l /dev/sda
Disk /dev/sda: 500.1 GB, 500107862016 bytes 255 heads, 63 sectors/track, 60801 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Disk identifier: 0x000265ce
Device Boot Start End Blocks Id System
/dev/sda1 * 1 39 307200 83 Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2 39 60801 488076288 83 Linux
[Code]...
Some posts that I've come across indicate no problem while others indicate that it is an issue and needs to be corrected. sda1 is my /boot partition ~ 300MB and then sda2 is a LUKS volume with a LVM VG occupying the rest of the available 500GB hdd. It is my active F 12 system with no dual boot.
1. Is it a problem? 2.Can I just resize sda1 so the end does not overlap sda2? 3. And can I do this while booted from that system or do I need to do it from a LiveCD?
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Nov 12, 2010
i was looking at the list of my /dev/sda partition and on the first partition it says that it does not end on cylinder boundary. does is it need to be fixed? on a book that im reading it says that when you create a partition the end cylinder should be the size of the partition...
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Feb 22, 2011
I am preparing a dual boot system. Used gparted to do the partitioning. Unfortunately did not notice that one can choose to align on MB (default) or cyl (probably preferable) Now my setup is running ok but fdisk reports warnings like Partition 4 not on cylinder boundary
Looking up the net I see two conflicting views on this:
1. Forget it -- cylinders are not relevant on today's disks
2. For linux this is ok but windows may clobber the adjacent partition in such a 'non-aligned' partition
The real problem is that parted, gparted, fdisk etc are mutually inconsistent in what kind of partition table is 'good' and I dont know who to believe
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Mar 3, 2011
I have a 500g hard drive using dual boot win7 and ubuntu 10.04.2. The system is boot from MBR using Grub1.98. The partitioned as the follows:
system reserve100m ｜win7,42g｜software 100g｜empty 100g｜extended 253g
logic partition is as follows:
| ubuntu / 250g | swap 4g
Since I want to make use of the "empty" part. I delete it and the "software" partition under win7. Then I create a new partition on the part.
After I reboot my pc, the screen shows:
>> operating system no such partition.
[Code]...
how to resize my partition table so I can KEEP MY DATA on the ubuntu / partition. Or someway I can get my ubuntu / partition back.
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Aug 30, 2010
Below is a print out of my partition Table from Fdisk, in Cylinder mode, Sector mode, and then in expert mode?
Why in expert mode does it look like Partitions 2 and 3 share the same sector / hd / Cylinders? Is this OK?
Code:
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Mar 25, 2010
As soon as I install and reboot OpenSUSE, my partition table gets lost somehow. Here is some information about my system:
Dual-booting system with Vista and OpenSUSE 2 SATA hard drives combined into one with Vista installed on them. 1 IDE hard drive with OpenSUSE installed on it.
When I install OpenSUSE, it loads fine right after the installation. Then, when I reboot the computer and select to load OpenSUSE from the Grub loader menu, it hangs right after:
root(hd4,1)
Filesystem type is ext2fs, partition type 0x83
kernel /boot/vmlinuz-2.6.31.5-0.1-desktop root=/dev/disk/by-id/ata-IC35l....... and so on
I tried running System Repair off of a DVD and automated test - it tells me that the partition table is lost. I choose to recover partition table and after a while it does but I am still unable to boot.
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Aug 6, 2010
Is there a difference between using GPT partition table when formating hard drives and MS-DOS partition table? What are the advantages/disadvantages of using either?
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Aug 22, 2011
fdisk -l: Disk /dev/sda: 750.2 GB, 750156374016 bytes.
[Code]...
I've tried other installations, but I always get errors like this. /dev/sda 5, 7 and 8 are occupied by PCLinuxOs. /dev/sda 9, 10, 11 and 12 by Fedora. I made room for Linux installations by GParted (last version). Really, I made no errors. The installer of PCLOS is a bit strange: it changed the NTFS partition sda5 in sda 6! In a previous installation with Fedora and Kubuntu only the extend partition sda 4 complained about not starting on physical sector boundary. The hard disk is Western Digital with Advanced Format. Probably this is the cause of the problem. The systems are snappy and responsive. I do not encounter any problem. What to do? Ignoring the problem or reinstalling? May be it would be better to get rid of PCLOS and to dual boot Windows with Fedora?
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Jan 16, 2011
I have installed 10.04 LTS on a few computers lately (stuck at home due to recent surgery and am trying to kill some time) and have been running into some odd issues and cannot figure out what is going on. I am hoping someone can help me out here. The installation appears to work fine every time. The systems also appear to be running without any issues. The weird thing is that every time I run an fdisk -l command, I always get these types of messages:
Disk /dev/sda: 3221 MB, 3221225472 bytes
255 heads, 63 sectors/track, 391 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0005437b
[Code]...
cfdisk also gives similar errors:
FATAL ERROR: Bad primary partition 1: Partition ends in the final partial cylinder. I am not doing anything out of the ordinary when installing Ubuntu (as far as i can tell that is). I am not pre-partitioning with external tools for example. I use the Ubuntu installer to setup my partitions.
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May 20, 2010
I was installing opensuse 11.2 in parallel with windows xp.but during installation suddenly power has gone and after that opensuse is giving me the error message corrupt partition.i am also not able to login in xp. so I decide to reinstall windows, I got the error saying "invalid partition table" after the first restart of windows xp installation.
I tried to use windows system recovery console and committing fixmbr and fixboot commands, but didn't work.
i have 2 window partition(1 for windows and 1 for data).i do,nt want to format 2,nd partition.
How can I installed windows?My plan was first to install windows xp, then opensuse again.
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Jan 26, 2011
I have tried to automate the configuration of a usb drive with not much success.
The problem that I have is that I have a large amount of usb drives that have a partition table of type "loop" and I need to change them to "msdos". The size of the drives vary and I need to use FAT32 or FAT16 file system.
I've tried various partitioning commands and gui applications but cant find one that I can give a one line command to to set the partition table, maximum partition size and file system.
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Feb 8, 2010
I was reading another thread about someone with a bad partition table and I decided to join this forum. I'm not going to take any drastic actions with the partition (/dev/sda3) in question. I am going to wait for instructions on what to do first. I am not very good with Linux and need some hand holding. System: DELL 4550 Dual-Booted with XP and Ubuntu. Works OK, just no swap. Well, here's what I did: I deleted a partition for Windows XP Pro because it was a trial, and it ran out. I then decided to slide the swap partition for the Ubuntu Linux that I dual-boot into over. (If this was successful, I was going to try expanding the root partition to take up the unused space.) I used Gparted on a CD to do this, as I figured it was safe to do.
I now cannot mount the swap space at bootup (and have to go into a backup version of the OS), although I can use Gparted in Linux to execute the "swapon" command, and it appears that it worked because I now see "swapoff" as an option on the context menu. (I actually don't even need a swap partition, except to hibernate.) If I highlight the swap partition and click on "Drive" on Gparted's menu bar and select "Create Partition Table", it will erase all data on /dev/sda, so how do I fix the bad partition table non-destructively?
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Apr 24, 2010
Everything is installed and setup on my system, but when I setup my partitions I chose my Windows partition to be bootable. Can I just use cfdisk to toggle the bootable flag so my linux partition is bootable and rewrite the partition table?
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Mar 27, 2010
I want to change my sda2 partition to ntfs type. i have installed GParted but it is returning a strange type of error. Here is the error dump file...
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WARNING: the kernel failed to re-read the partition table on /dev/sda (Device or resource busy). As a result, it may not reflect all of your changes until after reboot. WARNING: the kernel failed to re-read the partition table on /dev/sda (Device or resource busy). As a result, it may not reflect all of your changes until after reboot.
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Feb 5, 2010
Is there a program that will reread the partition table and update the kernel even if one of the unmodified partitions is mounted? I installed my system on one partition, then I added another with free space. Now I want to format the second partition, but the kernel doesn't know about it yet. I tried sfdisk -R /dev/sda, but it refuses while the root partition is mounted. Is there anyway I can avoid rebooting?
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Feb 17, 2011
USB flash disk partition disappeared as well as partition table I'm not sure about the cause
Code:
root@u# less /var/log/syslog
usb 5-1: New USB device found, idVendor=058f, idProduct=1234
usb 5-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[code]....
Where did the partition table go? The device had one ext3 partition something around 4GB(size of USB storage device). I need to restore few files from this device.
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Nov 19, 2009
I'm trying to clone a Linux install to a different laptop. It's made a little complicated by two facts:
1) The 'new' laptop I'm trying to copy my Linux installation to is actually older and has a smaller hard drive then the computer I'm copying from
2) The computer I'm copying from has both a windows and Linux installation; I only care about the Linux partition.
I figured I would copy only the Linux partition from my primary computer to the laptop, sense the laptop doesn't have a large enough hard drive to copy everything. So I used the DD commands to copy SDA3 (main Linux partition) from my main computer to SDA2 of my laptop. When I came back a few hours later I was surprise to find my laptop trying to reboot itself (I never turned it off). It would keep starting to reboot, failing, and restarting itself. Not too surprising sense its boot partition wasn't changed so it's trying to boot into centos when I copied a redhat partition to it.
The problem is that when I used a redhat boot disk the rescue mode was unable to find a Linux partition to mount. /dev/sda2 exists, but trying to mount it gets the complaint "No such file or directory". "fdisk -l" lists sda1 (the boot sector) and sda2. Sda2 is the correct size and reports Linux LVM for its system. But "fdisk -l /dev/sda2" gives the error message "Disk /dev/sda2 doesn't contain a valid partition table" Did I not clone the drive correctly, or was an error caused due to the boot sector not being copied yet (the laptops boot sector is smaller then my old computers, so I can't copy from old computer to laptop)? Can I salvage the laptops partition table somehow, or do I have to repeat the cloning process? And if I do have to re-clone my computer can anyone tell me what I did wrong the first time so it works this time? I don't care if I copy just the Linux partition or both windows and Linux. Even though my main computer has a larger hard drive I'm only using about half of its available space so it should be possible to copy both partitions if I could ignore the unused sections of the harddrive.
Edit: I used DD to copy a tiny part of the Linux partition from my laptop so I could look at it. Most of it is illegible binary of course, but I scrolled through till I found some text right near the beginning:
Code:
VolGroup00 {
id="F2MWxh-....-BidcLe"
seqno = 1
[code]....
So it seems that the DD command did copy everything over to the laptop, which is good to know. I noticed that it says device="/dev/sda3" right in the middle of the code I just posted. The Linux section of my original computer was SDA3 but I copied it to partition SDA2 of my laptop. So is the problem because the boot partition is for the wrong device? I don't suppose if I modified that one line to say SDA2 it would be able to load correctly? (Not that I know how I would modify the line, short of using the DD command again).
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Jan 8, 2011
I want to install Arch Linux on my desktop, it is going to be a dual boot with Windows. I booted into the installation CD, but when I started cfdisk to partition my hard drive it gave me the following error: FATAL ERROR: Primairy parititon 1, partition ends in the final partial cylinder.The QuestionHow can I troubleshoot and fix this?Additional details
These will be added if asked for.
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Oct 5, 2010
What I believe has happened is that I've corrupted the partition table. Essentially one of my partitions' ending point exceeds the maximum number of cylinders/sectors on my drive.
Essentially I have the same problem as on the thread @ [url] but do not know how to fix this and am afraid to reformat/partition based on sectors without really knowing what I'm doing here.
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When I try to look at SDA in GParted everything shows up as unallocated (though it's obviously not) and it says
[code]...
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Jul 29, 2011
In my efforts to resize my BTRFS Partition, I accidentally unmarked my BTRFS partition as being BTRFS, and can't mark it back as I can't find the numeric ID for BTRFS and how to apply.
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Oct 9, 2010
"You could not allocate the cylinder based partition". I am getting above error while trying to create disk partition in disk partitioning while Redhat installation.
i want to use dual boot system....windows 2003 and Redhat.Win 2003 is installed on 'C:' in my primary hard drive.i have one more hard drive on secondary IDE.secondary HDD having 13 GB unallocated partition. and i want to install Redhat on this partition. But while trying to create disk partition i am getting error "You could not allocate the cylinder based partition". it this time i can create only root or swap partition. plz tell me whats to do in such case.
If i create root partition of 11 GB and leave 2 GB for swap, then can i create swap partition after installation is finished. if yes the plz tell how to do this? Or i can allot 13 GB for Root partition and once installation finished i can create 2 GB swap partition from this 13 GB? Also i will like to know what kind of partitions i need to create at the time of installation????
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Aug 23, 2010
I installed Ubuntu as shown in the wiki and when I went to restart it gave me a lovely blinking cursor and nothing else. So I held down option, loaded into osx, reinstalled rEFIt and got my menu on startup. Unfortunately, the partition sync tool doesn't seam to be working, it gives me an error: Status: MBR partition table is invalid, partitions overlap. Error: Not Found returned from gptsync.efi
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Jul 18, 2011
I originally had an Ubuntu partition on my hard drive which occupied about half of it. I installed Windows 7 in the remaining unallocated space and I was planning on doing a grub update from a live cd afterwards. BUT when I looked at my partition table, the space where the ubuntu partition used to be is now unallocated space!
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Nov 5, 2010
I need to copy partition table for sda, I have 3 primary partitions and 1 extended partition on sda. I understand that fdisk cant copy extended partition table and I need to use sfdisk.
Correct me if I am wrong -
1. For primary partitions
Code:
dd if=sda-mbr.bin of=/dev/sdX bs=1 count=64 skip=446 seek=446
2. For extended partition
Code:
sfdisk -d /dev/sda2 > backup-sdX.sf
Where it will store the files after backing them up. I tried SUSE 11.2 DVD, it has back up partition table utility under repairs-advanced options but it suggests saving partition table to floppy. Why it doesnt offer to save it on a removable medium or to CD.
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Oct 8, 2010
I got swap space full error and the ubuntu version of "blue screen of death". I used Disk Utilities to delete a 2.1GB unused partition. When I tried to create a swap space partition (with Disk Utilities) it failed. In the mean time ubuntu did some security updates. When I tried to create again Disk Uilities did not complain but only created a small ~ 500 kB partition. I deleted that and reboot and got "unknown filesystem grub rescue>". I booted from a USB key successfully. Now Disk Utilities and File Browser can see all the partitions and files on the hard drive, but GParted thinks the entire hard drive is unallocated. I vaguely remember that there are two partition table on the hard drive. It may be that one of them was deleted (when I removed the ~ 500 kB partition with Disk Utilities earlier maybe?). It seems at least the other partition table is still intact since Disk Utilities and File Browser can still see all the partitions and files. Is it possible to restore the deleted or damaged partition table and make the hard drive bootable again?
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Oct 18, 2010
I Inadvertently deleted a good partition while trying to clean up after a 10.10 update install failure that left grub broken and prevented me from using my working Linux partition. (installed 10.4 in a new partition) Used testdisk to restore the deleted partition which resulted in the entire partition table being wiped out.All partions are gone, win Xp, 2 Linux partitions, 2 Linux swap partitions.Testdisk deep search does see the partitions but will not recreate the table.
Is their anything I am doing wrong in Testdisk that it won't write the table?Nothing else has been written to the disk.I very carefully recorded the partition information - is their any way to manually enter?
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Jun 11, 2011
A couple of years ago, I got a 2TB drive and installed Debian on it.
I used the standard installation procedure, as I recall, and created three partitions, which are shown below in the output of "fdisk":
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Feb 21, 2011
I have a hard disk with a non standard partition order which is likely to have to have a windows restore done on it. I actually have it the way I want it atm. I am interested in finding out if there is a handy way to back up the partition table, like I can backup the mbr. Where does the partition table hide? 160 Gig Sata hd, btw.
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Jul 27, 2010
I have a problem with one hard disk,now it says its Unallocated,and i tried to create a new partition on it,but it says that first i need to create a partition table,but when i create one,choosing msdos label,it doesnt to nothing. I used Gparted in Fedora,how can i create a partition table,so i can use my hard disk again?
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