I have a 1TB harddisk /dev/sda and I bought a 2TB new disk /dev/sdb. There're already some partitions in sda.

I run dd if=/dev/sda of=/dev/sdb, then threw my old 1TB disk /dev/sda into dustbin. Then I boot into the OS in new disk, everything works well.

Then I want to add a new partition to /dev/sdb. I run gdisk but it doesn't allow me to do so.

Here's what gdisk says: (There's 3907029168 sectors(2TB), but last usable sector is 1953525134(1TB))

Command (? for help): p
Disk /dev/sdb: 3907029168 sectors, 1.8 TiB
Model: ST2000LX001-1RG1
Sector size (logical/physical): 512/4096 bytes
Disk identifier (GUID): F1EABB30-5410-4D71-AF46-3AA39380AB87
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 8-sector boundaries
Total free space is 4068 sectors (2.0 MiB)

Number  Start (sector)    End (sector)  Size       Code  Name
   1            2048          534527   260.0 MiB   EF00  EFI system partition
   2          534528          567295   16.0 MiB    0C01  Microsoft reserved ...
   3          567296       573710282   273.3 GiB   0700  Basic data partition
   4       778510336       780386303   916.0 MiB   2700  
   5       780388352       781410303   499.0 MiB   2700  Basic data partition
   6       781410304      1200836310   200.0 GiB   0700  Basic data partition
   7      1200836312      1515409111   150.0 GiB   0700  Microsoft basic data
   8      1515409112      1725124311   100.0 GiB   8300  Linux filesystem
   9      1725124312      1953525134   108.9 GiB   0700  Basic data partition
  10       573710288       778510335   97.7 GiB    8300  Linux filesystem

Command (? for help): n
Partition number (11-128, default 11): 
First sector (34-1200836311, default = 780386304) or {+-}size{KMGTP}: 1953525135
First sector (34-1200836311, default = 780386304) or {+-}size{KMGTP}: 

What's wrong?


1 Answer 1


Solved by this post: https://serverfault.com/questions/848576/unable-to-extend-partition-with-gdisk-on-xenserver-6-5

My disk is 2TB now but GPT partition table still thinks there's 1TB. Use v to verify the disk, it says

Problem: The secondary header's self-pointer indicates that it doesn't reside
at the end of the disk. If you've added a disk to a RAID array, use the 'e'
option on the experts' menu to adjust the secondary header's and partition
table's locations.

Identified 1 problems!

Run x(expert mode) e(fix the pointer) m(return to main menu) p(re-check your modification) w(save!), then everything is ok.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.