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Linux - Restoring Backup with DD & Netcat - Can't write to /dev/sda device
Disclaimer: /dev/sda is not mounted (It wasn't mounted when I backed it up, and it isn't mounted now that I'm trying to restore the backup)
Hi, i made a backup of my hard drive a month ago with:
dd if=/dev/sda | nc IP PORT
Now, I need to restore my backup, so I'm doing:
nc -l -p 1234 | dd of=/dev/sda
My sender computer is sending, but the receiver isn't doing much of any receiving... It appears that roughly 16 megs are being sent, but none received - In fact, when I hit Ctrl-C, i get the message:
write(stdout): Interrupted System Call
and then my terminal is locked up.
I've attempted to run Ubuntu 7 Live CD & Trinity Rescue CD Build 318 -- both operating systems encounter the exact same problem.
It's possible that my hard drive is broken, but I think it's fine
Any tips on writing directly to /dev/sda without mounting?
Thanks
Hi, i made a backup of my hard drive a month ago with:
dd if=/dev/sda | nc IP PORT
Now, I need to restore my backup, so I'm doing:
nc -l -p 1234 | dd of=/dev/sda
My sender computer is sending, but the receiver isn't doing much of any receiving... It appears that roughly 16 megs are being sent, but none received - In fact, when I hit Ctrl-C, i get the message:
write(stdout): Interrupted System Call
and then my terminal is locked up.
I've attempted to run Ubuntu 7 Live CD & Trinity Rescue CD Build 318 -- both operating systems encounter the exact same problem.
It's possible that my hard drive is broken, but I think it's fine
Any tips on writing directly to /dev/sda without mounting?
Thanks
ASKER
Dual,
In the debian flavor of Linux, i've been using nc -l -p 1234. A single -l flag indicates "listen mode" and -p #### specifies the port.
Regardless, I did test the command that you suggested. This resulted in all incoming connections being rejected.
In the debian flavor of Linux, i've been using nc -l -p 1234. A single -l flag indicates "listen mode" and -p #### specifies the port.
Regardless, I did test the command that you suggested. This resulted in all incoming connections being rejected.
ASKER CERTIFIED SOLUTION
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The nc man pages state
-p source_port
Specifies the source port nc should use, subject to privilege
restrictions and availability. It is an error to use this option
in conjunction with the -l option.
One of their examples is
nc -l 1234
I tried with your example of "nc -l -p 1234" and it comes up immediately with usage instructions.
It looks like you should not be specifying the -p option. Just try
nc -l 1234 | dd of=/dev/sda
I haven't used the dd command so I cant vouch for the rest of the command but it seems you have the wrong syntax for the nc command.
Andrew