On Wed, 2 Aug 2006, David P James wrote:
I inserted the disk into a linux box (as hdb) along with the new disk
(as hdc). The new disk is at this point still unpartionned. Fdisk
cannot read the partition table of the failed disk.
To use ddrescue, should I attempt to copy the contents of the entire
disk over to the new, unpartionned disk:
ddrescue [options] /dev/hdb /dev/hdc rescue.log
or should the new disk be partionned first and the drives of the failed
disk copied over one by one?:
ddrescue [options] /dev/hdb1 /dev/hdc1 rescue_c.log
ddrescue [options] /dev/hdb5 /dev/hdc5 rescue_d.log
You wrote that fdisk can't read the partition table, yet you mention hdb1
and hdb5?
If you CAN read the partition table, at least enough to have linux find
them, then copy to two separate partitions on hdc. Having two of them will
make it easier.
However, if linux can't read the partition table of hdb, then you have no
choice, but to copy the entire disk. Then later run a tool that will
attempt to rescue your partition, by searching the disk for 'start of
filesystem'.
If the problem is that, linux can read the partition, but fdisk refuses to
show it to you, just cat /prod/partitions, and find the size column.
On your new hard disk make the two new partitions the same size in as
measured in sectors.
-Ariel
PS. If linux is reading the partition table, but you suspect it's wrong
then don't trust it.
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