Solusi Memperbaiki Tabel GPT cadangan yang rusak

MWI – Hardisk Eksternal adalah tempat cadangan file-file penting yang kita miliki, terkadang karena satu dan lain hal HDD yang kita miliki menjadi lambat dibuka, terkadang malah error dan tidak dapt dibuka sama sekali. Terkadang jug amuncul pesan error seperti ini “GPT PMBR size mismatch (1953525167 != 1953525166) will be corrected by write. The backup GPT table is corrupt, but the primary appears OK, so that will be used”. Beberapa hal yang menyebabkan ini terjadi adlah karena:

Kabel HD yang kurang bagus
Pasokan listrik yang kurang dari port atau kabel USB
langsung cabut atau karena tercabut tanpa prosedur yang benar

Setelah mencari muncul solusi dari Fixing corrupt backup GPT table? yang didapat dari Ask Ubuntu dot com, solusinya menggunakan perintah gdisk. Secara rinci yang saya lakukan adalah

cek HD yang masuk di laptop/PC/Komputer kita, caranya (asumsi posisi pada user biasa $ dan punya hak sudo – Super User DO, jika pada posisi root # hilangkan perintah sudo)

sudo df -h

musa@msthink:backup$ sudo df -h
Filesystem      Size  Used Avail Use% Mounted on
udev            3,8G     0  3,8G   0% /dev
tmpfs           784M  1,8M  782M   1% /run
/dev/nvme0n1p5  201G   74G  117G  39% /
tmpfs           3,9G  103M  3,8G   3% /dev/shm
tmpfs           5,0M  4,0K  5,0M   1% /run/lock
tmpfs           3,9G     0  3,9G   0% /sys/fs/cgroup
/dev/nvme0n1p6  199G  123G   67G  65% /media/data
/dev/nvme0n1p2   96M   31M   66M  32% /boot/efi
tmpfs           784M   20K  784M   1% /run/user/1000
/dev/sda10      665G  312G  353G  47% /media/musa/data1
/dev/sda9       144G  103G   34G  76% /media/musa/2681443e-e49a-4b33-86e4-55b1676e3e04
/dev/sda4        80G   52G   29G  65% /media/musa/Windows

Lanjutkan dengan membackup GPT yang error (jaga-jaga jika ada hal yang tak diinginkan terjadi), dengan perintah (sesuaikan sda dengan sdb atau lainnya sesuai hasil dari perintah sebelumnya

sudo sfdisk -d /dev/sda > musa_sda.txt

musa@msthink:backup$ sudo sfdisk -d /dev/sda > PT_sda.txt
GPT PMBR size mismatch (1953525167 != 1953525166) will be corrected by write.
The backup GPT table is corrupt, but the primary appears OK, so that will be used.

Berikan perintah gdisk untuk memperbaiki GPT yang corrupt dengan perintah

sudo gdisk /dev/sda
Command (? for help):

b back up GPT data to a file
c change a partition’s name
d delete a partition
i show detailed information on a partition
l list known partition types
n add a new partition
o create a new empty GUID partition table (GPT)
p print the partition table
q quit without saving changes
r recovery and transformation options (experts only)
s sort partitions
t change a partition’s type code
v verify disk
w write table to disk and exit
x extra functionality (experts only)
? print this menu

pilih p untuk print the partition table lalu v untuk verify disk lanjutkan dengan w untuk write table lalu q untuk quit, yang dikerjakan ditempat penulis seperti ini

musa@msthink:backup$ sudo gdisk /dev/sda
GPT fdisk (gdisk) version 1.0.5

Warning! Disk size is smaller than the main header indicates! Loading
secondary header from the last sector of the disk! You should use 'v' to
verify disk integrity, and perhaps options on the experts' menu to repair
the disk.
Caution: invalid backup GPT header, but valid main header; regenerating
backup header from main header.

Warning! One or more CRCs don't match. You should repair the disk!
Main header: OK
Backup header: ERROR
Main partition table: OK
Backup partition table: OK

Partition table scan:
  MBR: protective
  BSD: not present
  APM: not present
  GPT: damaged

****************************************************************************
Caution: Found protective or hybrid MBR and corrupt GPT. Using GPT, but disk
verification and recovery are STRONGLY recommended.
****************************************************************************

Command (? for help): p
Disk /dev/sda: 1953525167 sectors, 931.5 GiB
Model: External        
Sector size (logical/physical): 512/512 bytes
Disk identifier (GUID): 9469E2DA-479E-4AD5-A870-BADCF2B1D4EB
Partition table holds up to 128 entries
Main partition table begins at sector 2 and ends at sector 33
First usable sector is 34, last usable sector is 1953525134
Partitions will be aligned on 2048-sector boundaries
Total free space is 3437 sectors (1.7 MiB)

Number  Start (sector)    End (sector)  Size       Code  Name
   1            2048         1333247   650.0 MiB   2700  Basic data partition
   2         1333248         1865727   260.0 MiB   EF00  EFI system partition
   3         1865728         2127871   128.0 MiB   0C01  Microsoft reserved ...
   4         2127872       169900031   80.0 GiB    0700  Basic data partition
   5       169900032       170844159   461.0 MiB   2700  
   6       213286912       213503999   106.0 MiB   EF00  primary
   7       170844160       213286911   20.2 GiB    0700  Basic data partition
   8       213504000       229316607   7.5 GiB     8200  
   9       229316608       536459263   146.5 GiB   8300  
  10       536459264      1953523711   675.7 GiB   0700  data

Command (? for help): w
Caution! Secondary header was placed beyond the disk's limits! Moving the
header, but other problems may occur!

Final checks complete. About to write GPT data. THIS WILL OVERWRITE EXISTING
PARTITIONS!!

Do you want to proceed? (Y/N): y
OK; writing new GUID partition table (GPT) to /dev/sda.
Warning: The kernel is still using the old partition table.
The new table will be used at the next reboot or after you
run partprobe(8) or kpartx(8)
The operation has completed successfully.

Demikian sedikit tulisan tentang linux kali ini, semoga bermanfaat dan sukses untuk kita semua. (ms)

Referensi:
AskUbuntu.com

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