if [ -w branching: how to spot a locked USB stick

[Fergus]

 >> http://cygwin.com/ml/cygwin-cvs/2007-q3/msg00035.html

Thanks, Corinna, amazingly helpful and prompt (and concise) as usual.
However: here is an excerpt from a DOS command prompt:

Q:\home\user>dir  /ar /s /b <Enter>
Q:\home\user\sc\l\gn
Q:\home\user\sc\d\amy.d

In other words, under $HOME, there is one read-only folder ~/sc/l/gn/ 
and one read-only file ~/sc/l/d/amy.d.
However, ls -al exhibits this attribute only for the file and not the 
folder:

~> # NB In what follows ...
~> # ... amy.d  shows up as -r-- not -rw- GOOD ...
~> # ... but gn shows up as drwx not d-wx NOT SO GOOD
~> ls -alR sc
...
sc/d:
...
-r--r--r-- 1 fergus q.1.7    4829 Feb 16 07:00 amy.d
...
sc/l:
drwxr-xr-x 1 fergus q.1.7     0 Mar  8 14:56 gn/
...

and if [ -w ... also gets things wrong:

~> if [ -w sc/d/amy.d ] ; then echo +W ; else echo -W ; fi
-W
~> if [ -w sc/l/gn ] ; then echo +W ; else echo -W ; fi
+W

Is this something that could receive attention? (Hope I haven't somehow 
got things wrong myself.)
Thank you,
Fergus


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