Ilya Basin via Cygwin wrote:
Hi.
I was trying to write an .img file to a VeraCrypt drive.
VeraCrypt doesn't create a virtual PhysicalDrive so tools like Rufus don't see
it.
I hoped that with cygwin I would be able to do that, but Cygwin only creates
/dev/sd?? nodes for PhysicalDrive partitions.
I tried `dd` with '\\.\X:', but it can't open for writing because it treats it
as a directory (reading succeeds).
$ dd count=1 if='\\.\E:' | xxd
1+0 records in
1+0 records out
512 bytes copied, 0.0213007 s, 24.0 kB/s
00000000: eb52 904e 5446 5320 2020 2000 0208 0000 .R.NTFS .....
...
$ dd if=/dev/null count=0 of='\\.\E:'
dd: failed to open '\\.\E:': Is a directory
Could reproduce this. The inconsistency between open for reading vs.
writing of '\\.\E:' is actually interesting. Subtle bug in Cygwin?
Same error in MSYS2.
Does cygwin provide some (hidden) /dev/ nodes for drive letters or volumes like
"\\?\Volume{GUID}"? Can I create one with mknod?
Alternatively, VeraCrypt Volumes could be accessed via:
$ ls -l /proc/sys/DosDevices/E:
lr--r--r-- 1 ... /proc/sys/DosDevices/E: ->
/proc/sys/Device/VeraCryptVolumeE
But /proc/sys is completely R/O like /proc/registry, so you cannot write
the image via this path.
OT:
/proc/sys/Device/HarddiskVolumeShadowCopyN[/PATH/TO/FILE] allows to read
the image and individual files from a volume shadow copy.
--
Regards,
Christian
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