Special Forums Hardware Filesystems, Disks and Memory Using dd to copy a partition. Post 302530160 by newyorkpaulie on Monday 13th of June 2011 06:28:09 AM
Using dd to copy a partition.

Here's a conundrum. I use a ThinkPad (T30) which has a slot on the side for the hard drive. It is very easy to swap this with another hard drive which I keep as a backup. Now when I copy the Linux partition from my (in use) hard drive to the backup one (in my UltraBay slot) it takes only 30 minutes. If instead I copy this partition to my storage drive (in my docking station's drive slot) and save it as a file, the same copying takes 2 and a half hours. How come so much longer? Any thoughts?
From the hard drive to the backup I use this:
dd if=/dev/sda6 of=/dev/sdb6

From the hard drive to a storage drive I use:
dd if=/dev/sda6 of=/media/160GB/sda6file

Note that the file size is 18.0GB and the partition size is 28.6GB.

Last edited by pludi; 06-13-2011 at 10:32 AM.. Reason: Additional information added.
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APS(4)							   BSD Kernel Interfaces Manual 						    APS(4)

aps -- ThinkPad Active Protection System accelerometer SYNOPSIS
aps0 at isa? port 0x1600 DESCRIPTION
The aps driver provides support for several sensors found in some ThinkPad laptops. The sensors currently exposed via the envsys(4) interface are: Sensor Units Typical Use x-acceleration integer X-axis acceleration y-acceleration integer Y-axis acceleration x-variable integer Weighted X acceleration? y-variable integer Weighted Y acceleration? temperature 1 degC Unknown temperature temperature 2 degC Unknown temperature keyboard active boolean Keyboard activity mouse active boolean Mouse activity lid open boolean Lid state SEE ALSO
envsys(4), hpacel(4), thinkpad(4), envstat(8) HISTORY
The aps driver first appeared in OpenBSD 3.8 and was then ported to NetBSD 5.0. AUTHORS
The aps driver was written by Jonathan Gray <jsg@openbsd.org>. CAVEATS
Few issues can be mentioned. o The aps driver does not maintain state and subsequently does not take evasive action when it thinks the hard drive is in danger. Possi- ble actions would include spinning down the hard drive in case excessive tremor is detected by the sensors. o The Y axis on X40 and possibly other models seems to be inverted. It is unknown how to distinguish between different versions of the accelerometer to compensate for this in the driver at this time. o The sensor values are refreshed every 0.5 seconds. Because no protection measures are taken, this is unnecessary and may have a negative effect on battery life. o As IBM provides no documentation, it is not known what all the available sensors are used for. BSD
July 13, 2011 BSD

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