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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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REPARTITION(8)						      System Manager's Manual						    REPARTITION(8)

NAME
repartition - load a partition table SYNOPSIS
repartition device [partition-file] DESCRIPTION
Repartition uploads a new partition table for the partitions of device. The table is obtained from the first sector of partition-file if given, device otherwise. Device may refer to the whole drive or a primary partition, depending on whether you want to upload a partition or a subpartition table. The partitions will be truncated to fit within the enclosing device like the disk driver does, unless the numbers are coming from partition-file. EXAMPLES
repartition /dev/hd0 repartition /dev/hd4 /etc/hd4.table Reload the partition table of drive 0 setting /dev/hd[1-4], and the subpartition table of /dev/hd4 setting /dev/hd4[a-d] using a file. The latter may be useful if you need more than the 4 subpartitions a single Minix partition gives you. DIAGNOSTICS
The new table is printed on standard output. FILES
/dev/hd[0-9] SEE ALSO
hd(4), part(8). BUGS
The disk must be in use for the changes to stick. The partition table of an idle disk will be reloaded on the first open. AUTHOR
Kees J. Bot (kjb@cs.vu.nl) REPARTITION(8)
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