Brian Chadwick wrote:
Ian Malone wrote:
Brian Chadwick wrote:
Morgan Read wrote:
[root@morgansmachine DiskBUImagesEtc]# dd if=/dev/sda
of=2ndstage.rescue bs=1K count=1280
1280+0 records in
1280+0 records out
1310720 bytes (1.3 MB) copied, 0.0535238 s, 24.5 MB/s
[root@morgansmachine DiskBUImagesEtc]# chown morgan: ./2ndstage.rescue
[root@morgansmachine DiskBUImagesEtc]# dd if=zImage-LAB-20060421.htc
of=/dev/sda
2348+0 records in
2348+0 records out
1202176 bytes (1.2 MB) copied, 0.117155 s, 10.3 MB/s
[root@morgansmachine DiskBUImagesEtc]#
The point was Morgan has an accidental sort-of backup of the bit
he dd-ed over.
he copied 1280 blocks .... then overwrote it with 2348 blocks ... the
damage is done
Different block size: 1310720 bytes copied first (1K BS), 1202176 copied
second (512B BS). If more had been copied the earlier (33M) dd might
have been of some use, depending on what exactly is at the start of the
disk, but if / is /dev/sda1 then probably give up.
Interesting aside, both block-sizes are on the small side
(understandable given the intent of copying a pda boot image),
this may be why the first copy gets about twice the rate -
limited by the rate of copy operations.
--
imalone
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