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Operating Systems Linux Bring back a deleted partition Post 302321808 by otheus on Tuesday 2nd of June 2009 06:55:09 AM
Old 06-02-2009
If you have the /sys filesystem mounted, you're in good shape. Look in /sys/block/sda/sda*/start. These give you your starting block numbers for the each partition... the one the kernel knows about since the last reboot.

When fdisk asks for a number, it's usually a cylinder number, not a block number. To convert block numbers to cylinder numbers, divide by (63*255) -- in your case -- then add one. So I get:
Code:
cat /sys/block/sda/sda*/start
63
257040
17028900
21221865

The starting cylinder numbers are as follows:
Code:
1
17
1061
1322

The ending cylinder numbers should normally be the next starting minus one.
 

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FINDFS(8)						       System Administration							 FINDFS(8)

NAME
findfs - find a filesystem by label or UUID SYNOPSIS
findfs NAME=value DESCRIPTION
findfs will search the block devices in the system looking for a filesystem or partition with specified tag. The currently supported tags are: LABEL=<label> Specifies filesystem label. UUID=<uuid> Specifies filesystem UUID. PARTUUID=<uuid> Specifies partition UUID. This partition identifier is supported for example for GUID Partition Table (GPT) partition tables. PARTLABEL=<label> Specifies partition label (name). The partition labels are supported for example for GUID Partition Table (GPT) or MAC partition tables. If the filesystem or partition is found, the device name will be printed on stdout. The complete overview about filesystems and partitions you can get for example by lsblk --fs partx --show <disk> blkid EXIT STATUS
0 success 1 label or uuid cannot be found 2 usage error, wrong number of arguments or unknown option AUTHOR
findfs was originally written by Theodore Ts'o <tytso@mit.edu> and re-written for the util-linux package by Karel Zak <kzak@redhat.com>. ENVIRONMENT
LIBBLKID_DEBUG=all enables libblkid debug output. SEE ALSO
blkid(8), lsblk(8), partx(8) AVAILABILITY
The findfs command is part of the util-linux package and is available from Linux Kernel Archive <https://www.kernel.org/pub/linux/utils /util-linux/>. util-linux March 2014 FINDFS(8)
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