Fedora :: Hard Disk Data Recovery Of Ext2 And Ext3
Jul 1, 2010
I am student of MCS and working on final project. I am the user of windows xp. I am new in Linux. I am working on a project that titles "Hard disk data Recovery of ext2 and ext3 in linux". In windows, including dos.h and bios.h header files in program of c language I can send interrupt to bios and access most of the devices like parallel port, hard disks etc. But problem is that there is no bios.h and dos.h files in gcc. Now how can I access my hard drive using c program. How can I call int13h interrupt in linux or there is any other function in the linux to access the hard disk. In fact I want to access sectors of my hard disk using c language program. How can I do it?
We have had a hardisk crash in our RAID1 webhosting server running CentOS5 and Plesk. We first realized something was wrong when our main site didn't load but showed MySQL errors. We then found out that the system was in read-only state. Something that also happened the day before yesterday, but we could fix with a FSCK. Then the system worked well til around 18 hours later when it crashed with the same sympoms. So, we rebooted the server and wanted to do a filesystem check again. But the HDD wouldnt even load. It was gone. Unfortunatelly it was not realized that the second disk in the system was also not working any more for some time now. Fortunatelly we had our main site backed up externally though. So we could re-install a fresh box and mounted the two drives to the system. We checked the harddisk. One is practically empty (the older one), the other has almost only files in 'lost + found' but these are all "numbered", no real filenames or so.
I accidentally formatted a HDD when I meant to format a USB thumb drive. The HDD is a 250GB drive that had about 180GB of data in the EXT3 format. I was actually attempting to make a bootable USB thumb drive with TRK (Trinity Rescue Kit). Kind of funny/ironic to mess up a drive while trying to make a rescue disk. Anyway, as soon as I realized what had happened, I pulled the drive out of the computer to make sure I didn't do anything else stupid to it. I have been searching for some way to recover and haven't really found much. There are a lot of programs to get Windows data back, but I haven't seen anything specific on the EXT3 file system.
I have lost the data of my drive having file system ext3, please tell me the most reliable softwares for data recovery, please try to tell also GUI software.
I have an external 3.5" USB 250Gb HDD which is showing symptoms of hardware problems (repeated /var/log/messages errors of "reset high speed USB device using ehci_hcd"). This was originally plugged in to my NSLU2 running Debian Etch. I have just installed Ubuntu Desktop 9.10 to a spare Pentium-3M laptop and was hoping to copy the contents of this HDD to a fresh drive. However, I cannot mount it even read-only; mount -o ro /dev/sde3 /mnt/disk fails, and the /var/log/messages error is "recovery required on readonly filesystem", "write access unavailable, cannot proceed". I cannot understand why mounting a disk read-only should require write access. Following advice I googled elsewhere, I tried running mke2fs -n /dev/sde3 to try to list the alternative superblocks - but once again I got the error that the device was read-only. How can I go about accessing the data on this disk?
When installing fedora 10 from scratch on an acer aspire one 150L, which filesystem should be used? ext2 or ext3? a basic explanation of the reason would be great too.
I have a question, i accidentally formatted an lvm volume as ext2 after creating it. Then of course, we copied a ton of data to it before I realized it was ext2. (I guess ext2 was the default when using mkfs without a -t) Anyway - can I just use tune2fs -j on the LVM just like I would a /dev/sdx device?
When we copy a sector to a file like using dd command, the data in the file is of which format? and of which type of conversion is nesessary to see the data in read able formate. i have tryed the ASCII conversion in dd command but still the data is in un-readable format. and also tell that if i access hard disk sector's data using c language program and copy data to a file then which type of conversion should i do ?
A while ago my harddrive kinda failed. I didnt notice untill I got "Grub error 17" one time when I was trying to boot my computer. The problem is not really that I couldnt log on to my computer, but rather that I have alot of important information on the computer I would hate to lose. At the time I used Ubuntu 8.04 and had reiserfs filesystem on the computer. I bought a new computer and decided to wait untill I could rescue the data before doing to much dmg to it. But I dont really remember if I tried something to fix it before I realised that it was the harddrive and bad sectors that made me get gruberror 17. Hopefully I didnt do anything.
Anyway. Now today I had some extra time, so I decided to dive in. I booted from a linux mint disk and used ddrescue to transfer all the rawdata over the network to an image file laying on an ext4 drive. Once there I used reiserfsck to try and repair the filesystem. After that i mounted the image file and tried to access the files. Thats where the probelms started. I could see the whole treestructure of the harddrive and everything seemed ok, but when i tried to open the files, none of the pictures, documents and so on could be opend, and when I tried to open stuff like MP3 files they played quite strange. Videofiles was really messy, kept changing resolution and was almost always just gray and green squares on the screen. I decided to use ddrescue and move the files from the image file and on to a clean disk. So when I was done I could mount the filesystem on the new disk, but with the same resault, so I did reiserfsck again, and when that didnt help I did a buildtree also. Still with the same resault. So I decided to investigate the data abit. Opening files at random trying to understand what had hapend. And I saw that some MP3 files (the easiest to open) was some kind of mixing between several difrent mp3 files. Some files wasnt even in the same folder, so it was probably just that the file pointer was pointing at the wrong data on the disk. I dont know how that works really, so I dont know how to go on.
So now to the question. How do I get the data back? Have I done something wrong, can I redo somethig? I still have the broken disk and can take data from it once again, but I want to wait to do that untill I really know what to do. I also still have the image file, and the disk with the copied data. I have a ubuntu 9.10 system at my disposal atm.
I have never used Linux before and know nothing about it . But my cousin installed a Fedoro linux CD on my laptop which previously had Lotus symphony . Unfortunately my laptop had single partition and so Linux overrode the old OS ,ie lotus symphony .
I have some critical data on my hard disk but I have no clue how to take backup this data using Linux . I desparately need this data .
Could somebody let me know how I can access this data and take the backup ?
I'm running 10.04 LTS (64 bit) During a recent attempt at dual booting Windows 7, the Windows installer made a boot partition on the wrong drive, formatting the drive, and therefore destroying all my data.
The original partition was NTFS, and the new (unwanted partition) is NTFS.
Is there something in Linux I can do to recover the data that was there, or am I going to have to install Windows on yet another drive and use some Windows tools?
The data on this drive is extraordinarily important, containing ten years of digital photos, my source codes, and musical compositions (protools sessions etc).
I have an hp laptop with 2 hdd slots, both are sata. it came with a 320gb hdd with vista ultimate 64. i added another 320gb hard drive to my laptop and installed kubuntu on the second hard drive. Since vista was my primary hard drive, parts of grub were installed on it i.e. stage 1.5. And the rest was installed on the kubuntu hard drive. Because of that neither os would boot independently of one another.
I eventually got tired of kubuntu and in wanted to uninstall it. I formatted that disk. Now vista gave me grub errors, like I knew it would.I was going to fix the vista boot sector and mbr by running bootrec.exe off of the vista disc. But since I have an hp laptop, hp doesnt provide a recovery disc with just vista, it is an install of the factory image of the os plus software and therefore doesnt have the utilities I need to fix my problem.I ended up navigating to some sort of command line in the windows recovery environment and tried running it there, but no luck.
I tried navigating in the hp recovery environment, and accidently had vista start to reinstall itself on the drive, and actually I did that 3-4 times, each of which I stopped the recovery early on, within 30 seconds, but it had managed to mess up my partition table. I was wondering if there is some utilities in linux/ windows that will help me restore the partitions back the way they should be? I have done a data recovery with get data back for ntfs, and was pretty successful getting some stuff back, figures since the mft was screwed up.
So first of all I want to make an exact clone of the hard drive. Something like dd but just make an image file for now. Since there are no partitions on the drive I dont think I can use partimage, or drive image xml and I wonder if clonezilla will work. And I dont know how to test it without have to reload the image and wiping the drive in the process. I have imaged the drive with get data back but it does me no good cause I cannot restore that image back to the drive, or at least dont think I can.
Second I would like to see if I can recover the partition table , or mft that was over written. Here is a list of programs I can use for imaging or recovering. [URL]Third, since I have 2 320gb hard drives, one that is corrupted, and one that I took kubuntu off of and loaded vista with the recovery disks. Can I take the mbr, and partition table, or boot sector off of the working vista and move it to the broken 320 and fix it that way?
I have heard of a linux based data recovery for hard drives (corrupt) its bootable and once loaded and booted it will scan for drives and show there contents and let you pick and choose which ones you would like to back up/ save to a disk so you can wipe a drive and keep your info but I cannot remember the name of it.
Last time I installed Ubuntu in a dualboot configuration with Win7 on one of my machines, my entire boot sector and Windows install got corrupted, resulting in a complete loss of all my data and requiring a fresh install of Windows.
I looked into this a bit after the fact, and it seemed to me it was due to conflicting hard disk geometry between Linux and Windows.
My question is, how likely is this to happen with Fedora? Is this because of Ubuntu? A bad install? Is there someway I can avoid this from happening when I install Fedora if it will happen?
I accidentally formatted a 2TB drive of mine (big oops), but have recovered 2 of the 3 partitions using testdisk. My third partition is a LUKS encrypted partition. Testdisk managed to recover a piece of it, but it won't mount as most of it is unallocated. The partition originally occupied all space from sector 2,930,272,065 to the end of the disk -- sector 3,907,024,064. That is about 473 GBs. Currently, the partition only uses space from sector 2,930,272,065 to 2,930,288,129, about 7.84 MB.
The rest of the space is unallocated. Now what I need to do, is to expand the partition so that it occupies all the space that it used to. How would I do this? I cannot resize the partition, cause it would try to recreate the filesystem AFAIK and I don't want that, as it will fry my data. My data is not terribly important, but I would rather have it then not. I attached a screenie of kpartitionmanager. The partition in question is /dev/sdb2.
I am planning on dual-booting Windows XP and Ubuntu on a new laptop, and because I have a program that lets me mount an ext2 filesystem on Windows, I was thinking of installing Ubuntu with ext2 instead of ext3. I am concerned, however, that it might open up a security risk for my Ubuntu partition. Would this cause a problem? (In case it's relevant, I use AVG Free antivirus in Windows.)
I use 8GB USB sticks for backup of Ubuntu 10.04. I have had a variety of problems with ext3 format (security tar file not readable, etc) and have reformatted to ext2, so far without a problem.
But - am I missing something by not using ext3 (or even ext4)? Should I be sticking with ext3 and try to resolve the problems - bearing in mind that as the USB stick is my backup I need it to be secure!
I would like to convert my /tmp and /boot partitions from Ext3 to Ext2 on my Arch Linux setup. I don't see any use in having journaling for either partition. I want to make sure that I have the right steps lined up so could someone verify that this is correct (from a live cd):
Code: #sudo tune2fs -O ^has_journal /dev/sda7 #sudo e2fsck /dev/sda7 #sudo tune2fs -O ^has_journal /dev/sda5 #sudo e2fsck /dev/sda5 I then edit /etc/fstab to reflect these changes (ext3 to ext2 for both lines)
Does it matter what order I do it in (/dev/sda7 is /tmp and /dev/sda5 is /boot).
I was testing a bug in F12+Acer Aspire One and its 'suspend' feature (you can probably find the thread) and I ended with my SDHC card messed up. I formatted it as ext2 (or ext3, don't remember exactly) and apparently its superblock got corrupted. For one thing there is a single file I want to recover from the card (I don't mind formatting it afterwards). I am no expert using e2fsck or fsck, that's why I am asking here. In addition I used the "dd" command to create a backup of the drive in a file (so I can start tinkering with it). What is the best course of action to recover my files? Either from the card or from the image?
I run an upgrade and an update on a lucid lynx beta 2. --- got no problems. but about the filesystems i have some questions because it seems for me that at every system boot the system will run an fsck. somtimes it's shown up, somtimes not. but in /var/log/messages and in syslog
I have always following messages ( occured in beta 2 too ).
But first before i continue - here my disk layout:
And here my filesystem types:
This is my problem because those values are seems to be static ! ( note: this partiton is mounted but not in use ) and last not least: the drive is an external usb scsi disk. but on the other side lucid lynx is running fine on my box.
I have a new Vertex2 Solid State Drive. When I try to install any distributions, formating the drive in EXT3 or EXT4 (or LUKS with EXT3, or EXT4). My hard drive times out during a copy process. (OpenSUSE 11.2 for example would crash after the 2nd file of X11. Debian got ~12% done when it crashed.)
We are running debian off of an SD card and want to know what's best for /var?
- Plenty of room on 2GB SD card, so do we, make /var as large as possible (everything else is read only) to reduce block overwrites, or do we make /var as small as possible, hopefully reducing the load 'pdflush' places on the 200 Mhz system?
That said, why not ext2? Is there damage that can happen in /var due to insta-crash or power loss that will prevent proper system function? We heard ext4 is more optimized, but ext4 on 2.6.29, not sure.
If we must use a journaled file system for /var, then which is lowest load on system, or "better": jfs, ext3, jffs2 ...
i m not able to copy a file over 16 gigs on an EXT2 or EXT3 partition. Is there a way to do this. I even tried to split my iso file too. I splitted my iso file in 4 files then copy them on the ext2 or ext3 partition. But as soon as I was trying to join the files together it never went over 16 gigs. Actually it stops at 16,843,020 kb exactly. is there a limit for those partitions or is there an another way to see my 20gigs iso file in one piece?
I want to convert my swap space 8GB to usable formatHere is the output of sudo fdisk -l command$sudo fdisk -lDisk /dev/sda: 80.0 GB, 80026361856 bytes255 heads, 63 sectors/track, 9729 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytesDisk identifier: 0x26af26ae
Device Boot Start End Blocks Id System /dev/sda1 * 1 2295 18434556 7 HPFS/NTFS /dev/sda2 2296 9728 59705572+ f W95 Ext'd (LBA)
I have ext3 partition mounted on /mnt/shared/ as follows
Code:
Permissions above are of the actual mounted fs.
Goal is to have all files created on the fs 1) to belong to group 'users' 2) to have this groups permissions set to rw (rwx for directories) so that all users who belong to group 'users' have full read/write access to data and everyone else to have only read access.
Now because of setgid bit (s) in group permissions every file created has group 'users' and additionally setgid bit is set for directories. Because every users umask by default (on my system) is set to 0022 all created files will have permissions 644 for ordinary files and 755 for directories.
Net result of above means that users A and B who both belong to group 'users' won't be able to modify files created by the other.
So how can I make files created on the fs to be created always with umask 0002 WITHOUT changing default umask for users that is used elsewhere (like in their home directory) ?
so i used to have my harddrive mounted in fstab, to /mnt/diskS. than i decided to change the permissions to 766 global i believe i read somewhere with chmod. anyways so after that i checked to see if it worked and to my dis believe all my files are gone. or just arnt showing, the space taken up hasnt decreased but i just cant see any of my files. so i decided to take the harddrive out of fstab and restart my computer. and after restart when i click on the folder the harddrive is mounted in it says permissions belong to 1000?
