[SOLVED] fdisk -l shows different size than lsblk, and

vijaymaurya · 09-20-2017, 04:05 AM

Hi All,

We have added 300 GB disk from in VM but when we run fdisk -l shows 322GB.

fdisk -l /dev/sdc1
Disk /dev/sdc1: 322.1 GB, 322118383104 bytes, 629137467 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

lsblk
sdc 8:32 0 300G 0 disk
└─sdc1 8:33 0 300G 0 part /mnt

Kindly help how fdisk -l calculate the disk size and shows 322 GB instead of 300 GB.

syg00 · 09-20-2017, 04:49 AM

Read this.

michaelk · 09-20-2017, 04:58 AM

To elaborate the above...

The default output of the lsblk command is in human readable format.

1GB = 1,073,741,824 Bytes

If you use the -b i.e lsblk -b option you will see that they match.

Here is an example from one of my computers

Code:

fdisk shows      Disk /dev/sda: 160.0 GB, 160041885696 bytes
lsblk shows   sda      8:0    0 149.1G  0 disk  <- 160,041,885,696 / 1,073,741,824
lsbl -b shows sda      8:0    0 160041885696  0 disk

vijaymaurya · 09-21-2017, 02:45 AM

Thanks to all of you for your support.

Here i found the solution, why fdisk show different disk size than lsblak or df -h.

fdisk only calculate the values by dividing the disk size in bytes by 1000 instead of 1024, that's why you see the discrepancy in the value.

If you simply divide the value 322122547200 (in bytes) by 1000 three times, it will give you 322 GB size. And if you divide the same value by 1024, it will give you 300 GB size.