Jim Garrison via Cygwin wrote:
On 9/21/2023 22:40, Martin Wege via Cygwin wrote:
Hello,
How can I use /usr/bin/dd to copy a *.iso image (Debian netinstall
boot image) to a USB stick as raw bytes?
I do this frequently. You must start the Cygwin shell with admin
rights, then use Windows Disk Management mmc app to identify
the disk and convert from Disk n to /dev/sd[x], where Disk 0 is
/dev/sda, Disk 1 is /dev/sdb, etc.
BIG CAVEAT: You're in admin mode. Use the wrong device name and you
will trash target device if it's writable, including your Windows boot
drive. And no, the boot drive is not always Disk0 /dev/sda.
I always use hexedit to examine enough of the target device to assure
myself that it's the correct target.
This is much easier if 'ddrescue --ask' is used instead of 'dd'
(https://cygwin.com/packages/summary/ddrescue.html). It prints device
size, identify string and serial "number" string if available and asks
for confirmation then:
# ddrescue --ask --force image.iso /dev/sde
GNU ddrescue 1.27
About to copy 4671 MBytes
from 'image.iso' (4_562_040Ki)
to '/dev/sde' [Kingston DataTraveler 3.0::EE03D85142E0] (14_784Mi)
Proceed (y/N)? y
...
Device identity is also printed if the destination is a partition
(/dev/sde1) on that device. The --force (-f) option is required if the
destination is not a regular file. Note that for (S)ATA devices, the
serial may be printed in the unusual LE word string byte order from ATA
IDENTIFY data. This is a minor bug in some layer behind
IOCTL_STORAGE_QUERY_PROPERTY.
ddrescue also works with some /proc/sys block devices as source, for
example /proc/sys/Device/HarddiskVolumeShadowCopy2 or
/proc/sys/Device/VeraCryptVolumeF It could also be run from the limited
WinPE environment, for example to create an image of C: if not booted.
--
Regards,
Christian
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