I have had an external USB drive attached to a RaspberryPi (headless), 1.5 TB Volume, 100% partition NTFS.
During this question Creating ext4 partition from console, my goal was to change the overall fs to ext4 by shrinking the ntfs partition to 50%, copy all files to the new partition and resize the new ext4 to 100% partition.
After using ntfsresize (I first ran a simulation by -n which was fine and then forced the write action which ran without errors too), several errors occured on the partitions filesystem, (again, ntfsresize ran without errors, but the filesystem got damaged).
After shrinking the ntfs to approx. 600 GB, I used fdisk to remove the 100% partition and split it into two 50% partitions, using the correct partition type (I do not boot from this external harddrive, only store data) - which also did not show any errors.
At this point I noticed several errors and were not able to mount the drive anymore.
I really need the data which I cannot access anymore and willing to donate the one or the other beer (Paypal) to the person helping me to be able to access the data again.
Here are some outputs:
/dev/sda startinng sector 2048 end sector 2930272255 (1 sector = 512 bytes)
Size I shrinked the NTFS fs to: 656511M
Size I changed the NTFS partition to: a little less than total sectors / 2 => 1400000000 sectors
fdisk before partitioning:
Disk /dev/sda: 1500.3 GB, 1500299395072 bytes
255 heads, 63 sectors/track, 182401 cylinders, total 2930272256 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000303ee
Device Boot Start End Blocks Id System
/dev/sda1 2048 2930272255 1465135104 7 HPFS/NTFS/exFAT
Partition table after fdisk:
Disk /dev/sda: 1500.3 GB, 1500299395072 bytes
248 heads, 15 sectors/track, 787707 cylinders, total 2930272256 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000303ee
Device Boot Start End Blocks Id System
/dev/sda2 2048 1400000000 699998976+ 7 HPFS/NTFS/exFAT
fdisk verify:
Command (m for help): v
Remaining 1530274302 unallocated 512-byte sectors
ntfsfix /dev/sda2:
root@rasp:~# ntfsfix /dev/sda2
Mounting volume... Failed to load runlist for $MFT/$DATA.
highest_vcn = 0x68f, last_vcn - 1 = 0xe24f
Failed to load $MFT: Input/output error
FAILED
Attempting to correct errors... Failed to load runlist for $MFT/$DATA.
highest_vcn = 0x68f, last_vcn - 1 = 0xe24f
Failed to load $MFT: Input/output error
FAILED
Failed to startup volume: Input/output error
Checking for self-located MFT segment... OK
Failed to load runlist for $MFT/$DATA.
highest_vcn = 0x68f, last_vcn - 1 = 0xe24f
Failed to load $MFT: Input/output error
Volume is corrupt. You should run chkdsk.
ntfsfix /dev/sda:
root@rasp:~# ntfsfix /dev/sda
Mounting volume... NTFS signature is missing.
FAILED
Attempting to correct errors... NTFS signature is missing.
FAILED
Failed to startup volume: Invalid argument
NTFS signature is missing.
Trying the alternate boot sector
The alternate bootsector is usable
Set sector count to 2930272255 instead of 2930270207
Rewriting the bootsector
The boot sector has been rewritten
ntfs_mst_post_read_fixup_warn: magic: 0xffffffff size: 1024 usa_ofs: 65535 usa_count: 65534: Invalid argument
Record 0 has no FILE magic (0xffffffff)
Failed to load $MFT: Input/output error
Volume is corrupt. You should run chkdsk.
What I do right now: testdisk [REPAIR BS]
