Possible Duplicate:Can't mount EXT4 hard drive after mounting it in windows I have a 2TB Western External USB harddisk.I formatted it to EXT4.one time I plugged it to a windows machine and tried to mount it using ext2fsd; it mounted but after that I can't mount it in linux anymore (data is there and mounts in ext2fsd)!With help from someone (comments) I found that I had a partition on the disk before starting at the usual location of sector 2048.Now it seems recreating partitions fixes the problem.  How Can I recreate partition without loosing data?Is it this: mkfs.ext4 -S /dev/sdb? Thanks
Recreating EXT4 partition without losing data
linux;partition;hard disk;ext4