9/20/2023 0 Comments Open source drive image toolSector size (logical/physical): 512 bytes / 4096 bytes At the end of the harddisk is a swap partition, I ignore this for now. To get my NAS installation OMV from a SATA 500GB harddisk to a 240GB SSD, I booted the PC with an Ubuntu Live-CD, started Gparted and downsized the originalHDD /dev/sdb1 from 458 to 215GB. If you want to clone a large hard disk to a small one on a Linux computer, you can shrink the partition using gparted: Reducing the size of the partition for a Linux operating system, here OMV The size of the EFI and C partition must be at the beginning of the disk and must not exceed the space of the target disk. If dd (Disk Dump) is used, the recovery partition may not be cloned at all or only partially, depending on the disk space of the target disk, and must be cleaned up later. If the shrinking is only possible to a certain value, but there is still enough free space on the hard disk, defragmenting the hard disk may help. When upgrading Windows via the installation media, the recovery partition would be created again. And: Attention with the procedure described here, the recovery partition is lost, but we gain additional disk space. Since the partition is not absolutely needed for Windows to run, we don't need to clone the partition, accordingly we can ignore it at this point. Windows 11 probably has an additional recovery partition at the end of the disk here. The partition can be extended again to any size after the cloning process. In Disk Management we can shrink the C: partition, preferably as small as possible. To shrink the partition I change to the Disk Management: (In Windows 10 just search for "Disk Management" or in Windows 11: right click on the Windows icon and "Disk Management"). C:\WINDOWS\system32> reagentc /disableĪlternatively, the partition is recreated via the installation medium during a Windows upgrade. If you want to create the recovery partition again after the cloning process, you should execute the command "reagentc /disable" in the command prompt beforehand, this writes the contents of the partition to a file in the file system, see: Windows : create a missing recovery partition. Since the partition is not absolutely necessary for Windows operation, it does not have to be cloned. Windows 11 has a recovery partition at the end of the disk. Shrinking the partition is slightly different in Windows and Linux, the cloning process is identical for both operating systems. (Don't worry, the disk can always be made larger again later). In preparation for the cloning process, we need to shrink the data partition of the source disk. Since free image tools like dd (Disk Dump) are block-based and thus cannot detect the actual data on the hard disk, we have to help a bit when cloning to a smaller target. If you run out of space, you should delete unneeded files or move them to an external hard drive. The actual hard drive size doesn't matter when cloning, provided the occupied space of the source hard drive is not larger than the destination hard drive. In my tests, I cloned, among other things, a 130GB hard drive with existing Windows 11 installation to a 40GB hard drive. The cloning process is independent of the type of hard disk used, I have tested this with Windows 8 / 10 and Windows 11 and under Linux.Įxample: clone a large hard disk to a smaller one Transfer all data from one hard disk to anotherĬomputer, source hard disk, boot medium, target hard disk
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