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1answer
96 views

ext4 superblock backup locations are different from what is documented

When I format an ext4 filesystem the mkfs says: Superblock backups stored on blocks: 32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208, 4096000 My sparse_super flag is ...
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0answers
30 views

ext4 superblock checksum?

I'm reading the ext4 superblock, but its s_checksum (offset 0x3FC) is always zero. Also the s_checksum_type (offset 0x175) field is zero as well, however according to ...
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0answers
44 views

Traversing through the inode to find the contents of the file stored in different data blocks

I am reading about the EXT2 filesystem and I got an understanding about it. Every file system comprises of data and metadata (inode). The file system is divided into a number of blocks with 4 main ...
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1answer
2k views

Bad superblock on /dev/md0

I have an mdadm RAID 5 array running on Debian Wheezy. It's comprised of 3x 2TB drives. I've obviously done something stupid, because now I can't mount it and it's throwing up the following error: ...
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2answers
6k views

FAT filesystem - bad superblock

Last night my android phone said it can't read the SD card and it wanted to format it. I pulled it out, put it in a card reader and tried to mount it on my desktop pc: $ sudo mount /dev/sdb1 tmp ...
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1answer
507 views

Reassemble Raid 0 without superblocks?

I had Ubuntu 10.04 running. I created a software raid 0 with 3 drives. Today I upgraded to Ubuntu 12.04 (actually a fresh install) and now I am facing a huge problem: I cant reassemble the raid, ...
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1answer
360 views

HDD is preventing ubuntu from installing

I have recently attempted to install ubuntu on my laptop, replacing windows 7. The HDD was working fine with windows 7. On my first attempt to install ubuntu it kept giving me an error that was ...
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1answer
2k views

Degraded RAID5 and no md superblock on one of remaining drive

This is actually on a QNAP TS-509 NAS. The RAID is basically a Linux RAID. The NAS was configured with RAID 5 with 5 drives (/md0 with /dev/sd[abcde]3). At some point, /dev/sde failed and drive was ...
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3answers
3k views

mdadm Ubuntu 12.04 fails to assemble RAID6 during boot

I will try to keep this short. I have a mdadm RAID 6 with 11 drives. This has for years "just worked" across reinstalls and such, without any issues. I have not even had the need for configuring ...
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2answers
265 views

Will mdadm --zero-superblock render my Windows drive unbootable?

I have Windows 7 installed on a drive that used to be part of a RAID-1 array. Apparently the drive still contains the old RAID metadata, as when I boot into Ubuntu (which is installed elsewhere), the ...
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1answer
429 views

What's the difference between a superblock and an uberblock?

I'm trying to understand how the different types of blocks work for Unix / Linux file systems. Where can I find what the difference between a superblock and an uberblock means?
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1answer
1k views

How do I check for bad superblocks and fix them on a USB device in Ubuntu 10.04

I've found some instructions for this, but it seems the fsck options are outdated. Currently I am trying: mke2fs -n /dev/sdc4 then using the blocks listed in this: fsck -y -b 163840 ...
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4answers
9k views

SD card failure, can't read superblock

What is wrong with my SD card and is it salvageable? At very least to get the current data off. Information: I have an 8 GB Transcend Class 6 SDHC card that I got for my camera recently. It ...
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2answers
1k views

Issue when viewing the super block in ext3 file system

I tried to view the superblock by command "dd" in ext3 file system. dd if=/dev/sda3 bs=4096 skip=1 count=1 of=superblock But the result in superblock file is not correct(I compare the value of ...