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Date: Thu, 24 Oct 2024 12:09:12 +0300
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To: Ilya Basin <basinilya AT gmail DOT com>, cygwin AT cygwin DOT com
Subject: Re: Writing to '\\.\X:' that has no backing PhysicalDrive?
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From: Andrey Repin via Cygwin <cygwin AT cygwin DOT com>
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Greetings, Ilya Basin!

> 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

> 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?

Drive letters are not necessarily backed by physical drives.
F.e. subst drives.

> My current workaround is a PowerShell/.NET script that calls
> CreateFile/WriteFile with proper flags.
> Rufus doesn't show any hard drives, Win32DiskImager crashes on launch.
> Surprisingly, I couldn't find a decent GUI program for this task.



-- 
With best regards,
Andrey Repin
Thursday, October 24, 2024 12:08:30

Sorry for my terrible english...


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