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Date: Tue, 21 Dec 2010 06:39:59 +0000
From: Fergus <fergus AT bonhard DOT uklinux DOT net>
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CC: Fergus <fergus AT bonhard DOT uklinux DOT net>
Subject: Re: dd to linux partition
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 >> dd if=/dev/sda1 of=/cygrive/f/sda1.img  # windows, works!!!
 >> dd if=/dev/sda5 of=/cygrive/f/sda5.img  # linux, will not work

On my machine:

~> /usr/sbin/fdisk -l

Disk /dev/sda: 1000.2 GB, 1000204886016 bytes
..
    Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1        2048    16450528+   c  W95 FAT32 (LBA)
/dev/sda2            2049       63488   493516800   83  Linux
/dev/sda3           63489       64512     8225280   82  Linux swap
/dev/sda4           64513      121601   458567392+   5  Extended
/dev/sda5           64513       65536     8225248+   b  W95 FAT32
/dev/sda6           65537       66560     8225248+   b  W95 FAT32
/dev/sda7           66561       67584     8225248+   b  W95 FAT32
/dev/sda8           67585      116736   394813408+   b  W95 FAT32
/dev/sda9          116737      117760     8225248+  83  Linux
/dev/sda10         117761      118784     8225248+  83  Linux

~> dd if=/dev/sda2 of=./test.img count=1
1+0 records in
1+0 records out
512 bytes (512 B) copied, 0.043 s, 11.9 kB/s

Windows has to be made aware of any Linux partition(s) on your system. 
 From my experience "Ext2 Installable File System for Windows" works 
really well. See http://www.fs-driver.org/

Fire it up and the Linux partition becomes totally accessible 
(read-write) from Windows, and therefore from Cygwin. Incidentally 
really useful for drag and drop, whatever, without going near Cygwin.

I've never tried it for other than ID b i.e. ext2; and only on the XP 
platform. Maybe it is extensible (ext3 etc; Vista, W7) or maybe googling 
for something similar will get you something more elaborate, if you need it.

Fergus


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