Clone nvme drive with 4096 sector size to ssd with 512 sector size

cloneddhard drivenvmessd

I have an nvme drive with a logical and physical sector size of 4096.
The block size of this drive as reported by blockdev --getbsz command to be 4096 as well.

The destination drive is an SSD with a logical and physical sector size of 512.
The block size of this drive is 4096.

I tried using dd with the next parameters to clone the drive:

dd if=/dev/sda of=/dev/sdb

but the only partition that i am getting is GPT partition.

I also tried cloning the GPT table with those commands:

sgdisk

and

sfdisk

but no luck there.
i am getting a drive with a partition table that every partition is 8 times smaller than the partition in the original drive.

Do you have any suggestions?

Best Answer

GPT and MBR use sectors numbers to assign partitions. You need create new GPT table on new disk with partitions which have the same sizes in bytes as partitions on old disk. Then you can copy from old disk to new disk each partition:

dd if=/dev/sda1 of=/dev/sdb1 ibs=4096 obs=512 bs=16M

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Clone disk with dd, and change blocksize

Create NTFS partition on /dev/hdb(with -c option) and copy file from /dev/hda. block size is set when you create the filesystem, dd can't change block size.

   -c, --cluster-size BYTES
          Specify the size of clusters in bytes. Valid cluster size values are powers of two, with at least 256, and at most 65536 bytes per cluster. If  omit‐
          ted, mkntfs uses 4096 bytes as the default cluster size.

Linux – I used “dd” to clone a drive to a larger drive. How to leverage the additional space (linux)

Instead of creating new partitions, look at resizing your existing partitions. For this, I use GParted.

http://gparted.sourceforge.net/

Specifically, I use the GParted Live CD which you can just boot into from CDROM.

http://gparted.sourceforge.net/livecd.php

With it, you can resize your partitions and most file systems (excepting some LVM and/or MD sets.)

Once done, you can reboot back to your hard disk and you're good to go.

I've used this both in physical and virtual environments. In a VM environment, it's great for keeping around small template VM's that can be "sized-up" for larger applications.

Best Answer

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Clone disk with dd, and change blocksize

Linux – I used “dd” to clone a drive to a larger drive. How to leverage the additional space (linux)

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