Hi,
Zibri wrote:
Hello!
I am writing you to inform you that I compiled ddrescue-1.25, 1.26 and
1.27 under cygwin.
Please note that 1.25 and 1.27 are also available as a package from the
Cygwin distribution.
For some reason, 1.25 works but 1.26 and 1.27 give "Permission denied" error:
ddrescue: /dev/sdg1: Fatal error reading the input file: Permission denied
this does not happen in version 1.25.
What can I change to make it work?
The Linux raw device emulation of Cygwin directly maps to device path
names of the NTDLL-layer including the permission checks enforced by
Windows.
https://cygwin.com/cygwin-ug-net/using-specialnames.html#pathnames-posixdevices
(Hint: The full NTDLL-layer is mapped to /proc/sys which allows raw
access to volume shadow copies, decrypted images of VeraCrypt
containers, etc.)
Are you sure that the difference appeared with the same device behind
/dev/sdg1 and ddrescue is run as administrator in all cases?
Windows allows raw R/O access to certain partitions (/dev/sdg1) on USB
flash drives without admin rights. The full device /dev/sdg and other
device types always require admin rights.
If Bitlocker is used on this partition, /dev/sdg1 is only accessible if
the partition is unlocked. Then the decrypted image of the partition
could be read. The full raw device /dev/sdg is always accessible, LBA
ranges of Bitlocker partitions are (of course) read in their original
encrypted form then.
--
Regards,
Christian
