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Full Discussion: Shrink my partition to new disk
Top Forums UNIX for Advanced & Expert Users Shrink my partition to new disk Post 302461296 by Corona688 on Sunday 10th of October 2010 01:30:45 AM
Old 10-10-2010
Quote:
Originally Posted by amol28kulkarni
Thanks for the reply
Would it be efficient to copy entire data, is there any way to just copy over the blocks and adjust them according to the newly created filesystem ?
If I knew of any I'd have told you so the first time you asked.
Quote:
Would tar be able to handle the corrupted data like dd can handle since dd does a blind copy.
You can't safely shrink a disk that might be failing -- disk metadata might be corrupted, not just files, making any rearrangement very hazardous to data integrity. You might get a useless hash, or nothing at all. Either make a blind copy, or don't.

There are ways to shrink a blind copy -- compression, or a sparse file -- but none of them leave the resulting image bootable. There's no such thing as a sparse partition, after all, just sparse files. If you're content with having your backup not be bootable, this would work, I wrote sparsecat to help do this. It creates sparse files with a brute-force approach, making sections full of NULLs sparse, meaning it won't screw up because of a trashed sector but might not make everything that COULD be sparse actually sparse. (I don't guarantee its safety or applicability or portability however, it's just a hack I wrote for my own use.)
Code:
dd if=/dev/disk conv=noerror,sync | sparsecat > /mnt/backupdir/sparse.img

Quote:
Is there a way of like creating another sparse image file of 2TB ... then copying over only required data blocks there which will exclude the empty blocks and then resizing the sparse image to 200GB.
If the disk is failing, you can't reliably know which blocks are occupied.
Last edited by Corona688; 10-10-2010 at 02:38 AM..
 

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LEARN ABOUT DEBIAN

scrounge-ntfs

scrounge-ntfs(8)					    BSD System Manager's Manual 					  scrounge-ntfs(8)

NAME

     scrounge-ntfs -- helps retrieve data from corrupted NTFS partitions

SYNOPSIS

     scrounge-ntfs -l disk
     scrounge-ntfs -s disk
     scrounge-ntfs [-m mftoffset] [-c clustersize] [-o outdir] disk start end

DESCRIPTION

     scrounge-ntfs is a utility that can rescue data from corrupted NTFS partitions. It writes the files retrieved to another working file system.
     Certain information about the partition needs to be known in advance.

     The -l mode is meant to be run in advance of the data corruption, with the output stored away in a file. This allows scrounge-ntfs to recover
     data reliably. See the 'NOTES' section below for recover info when this isn't the case.

OPTIONS

     The options are as follows:

     -c 	 The cluster size (in sectors). When not specified a default of 8 is used.

     -l 	 List partition information for a drive. This will only work when the partition table for the given drive is intact.

     -m 	 When recovering data this specifies the location of the MFT from the beginning of the partition (in sectors). If not specified
		 then no directory information can be used, that is, all rescued files will be written to the same directory.

     -o 	 Directory to put rescued files in. If not specified then files will be placed in the current directory.

     -s 	 Search disk for partition information. (Not implemented yet).

     disk	 The raw device used to access the disk which contains the NTFS partition to rescue files from. eg: '/dev/hdc'

     start	 The beginning of the NTFS partition (in sectors).

     end	 The end of the NTFS partition (in sectors)

NOTES

     If you plan on using this program sucessfully you should prepare in advance by storing a copy of the partition information. Use the -l option
     to do this. Eventually searching for disk partition information will be implemented, which will solve this problem.

     When only one partition exists on a disk or you want to rescue the first partition there are ways to guess at the sector sizes and MFT loca-
     tion. See the scrounge-ntfs web page for more info:

     http://memberwebs.com/swalter/software/scrounge/

AUTHOR

     Stef Walter <stef@memberwebs.com>

scrounge-ntfs							   June 1, 2019 						     scrounge-ntfs
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