Title: disk_recovery_reiserfs.txt
Subject: Recover data on bad disk with reiserfs partition.  My disk is 

Can't Mount my Seagate 200GB disk. It has reiserfs, bad blocks, 

Command:  mount /dev/hdc3 /mnt/hdc3
Error:    mount: wrong fs type, bad option, bad superblock on /dev/hdc3,
          or too many mounted file systems
bread: Cannot read the block (8210): (Input/output error).
bread: Cannot read the block (8210): (Input/output error).bread: Cannot read the block (8210): (Input/output error).According to Reiserfs home page, these messages are a sign of a bad hard drive:
REFERENCE: http://www.namesys.com/faq.html#errors
Command:  dmesg 
Error:    hdc: dma_intr: status=0x51 { DriveReady SeekComplete Error }
	  hdc: dma_intr: error=0x40 { UncorrectableError }, LBAsect=54431821, high=3, low=4100173, sector=54431821
	  ide: failed opcode was: unknown
	  end_request: I/O error, dev hdc, sector 54431821
	  ReiserFS: hdc3: warning: sh-2029: reiserfs read_bitmaps: bitmap block (#4161536) reading failed
	  ReiserFS: hdc3: warning: jmacd-8: reiserfs_fill_super: unable to read bitmap

# Can't run reiserfsck
Command:  reiserfsck  /dev/hdc3
Error:    bread: Cannot read the block (8210): (Input/output error).

# Found lots of bad blocks on the disk
badblocks -b 4096 /dev/hdc3

# I counldn't figure out all this.
  debugreiserfs -B badblock.txt /dev/hdb3

Solution: 1. dd_rescue to make copy of the partition.
          2. reiserfsck on the parition copy.
	  3. Mount and access data.
	  
# Install cd_rescue.
  wget http://www.garloff.de/kurt/linux/ddrescue/dd_rescue-1.12.tar.gz
  tar -zxvpf dd_rescue-1.12.tar.gz
  cd dd_rescue/
  make
  make install

# Make the copy of the partition into an image file.
  dd_rescue /dev/hdc3 hdc3.img

# Mount the image file to the loop back device
  losetup /dev/loop0 hdc3.img

# Check and fix file system
  reiserfsck /dev/loop0
  reiserfsck --fix-fixable /dev/loop0

# Mount copy
  mkdir /mnt/disk_recover
  mount /dev/loop0  /mnt/disk_recover