Permission on USB drive

[Morten Kjærulff <mortenkjarulff at gmail dot com>]

Hi,

These files:

$ ls -l
total 69892
-rwxr-xr-x 1 ???????? ???????? 2753883 Jul 27 20:41 20090725-0926-IMG_0610.JPG
-rwx------ 1 ???????? ???????? 2865345 Jul 25 09:29 20090725-0929-IMG_0611.JPG
-rwxr-xr-x 1 ???????? ???????? 3697761 Jul 27 20:41 20090725-0951-IMG_0620.JPG
-rwxr-xr-x 1 ???????? ???????? 3811827 Jul 27 20:41 20090725-1002-IMG_0622.JPG
-rwxr-xr-x 1 ???????? ???????? 3768959 Jul 27 20:41 20090725-1008-IMG_0627.JPG
-rwx------ 1 ???????? ???????? 4138508 Jul 25 10:08 20090725-1008-IMG_0630.JPG
-rwx------ 1 ???????? ???????? 3945343 Jul 25 10:17 20090725-1017-IMG_0632.JPG
-rwxr-xr-x 1 ???????? ???????? 3195039 Jul 27 20:41 20090725-1019-IMG_0635.JPG
-rwxr-xr-x 1 ???????? ???????? 2282720 Jul 27 20:41 20090725-1019-IMG_0636.JPG
-rwxr-xr-x 1 ???????? ???????? 5255071 Jul 27 20:41 20090725-1052-IMG_0638.JPG
-rwxr-xr-x 1 ???????? ???????? 4139599 Jul 27 20:42 20090725-1057-IMG_0642.JPG
-rwxr-xr-x 1 ???????? ???????? 3484719 Jul 27 20:42 20090725-1112-IMG_0643.JPG
-rwxr-xr-x 1 ???????? ???????? 3391627 Jul 27 20:42 20090725-1123-IMG_0646.JPG
-rwx------ 1 ???????? ???????? 2884849 Jul 25 11:53 20090725-1153-IMG_0648.JPG
-rwxr-xr-x 1 ???????? ???????? 2631543 Jul 27 20:42 20090725-1155-IMG_0652.JPG
-rwxr-xr-x 1 ???????? ???????? 2503598 Jul 27 20:42 20090725-1156-IMG_0661.JPG
-rwx------ 1 ???????? ???????? 3372648 Jul 25 12:02 20090725-1202-IMG_0662.JPG
-rwx------ 1 ???????? ???????? 4851903 Jul 25 12:05 20090725-1205-IMG_0664.JPG
-rwx------ 1 ???????? ???????? 3900525 Jul 25 12:07 20090725-1207-IMG_0666.JPG
-rwxr-xr-x 1 ???????? ???????? 4645172 Jul 27 20:42 20090725-1209-IMG_0669.JPG

are pictures from a camera, which I copied with google picasa from the
camera to my home computer. Some of the pictures have been edited
(rotated) with picasa. Then I copied them with rsync to my USB drive.
Now I am looking at them from my work computer.

They do not all have the same permissions, which I don't understand.
The differences to not match those that I have edited with picasa (I
am 95% sure). What should I look for?

Can I somehow set it up, so the files on the USB is readable on any computer?

Are they unreadable on my work computer because I used a cygwin tool
to copy them to the USB, or is all this pure windows?

If I chown the files to my user on my work computer, I can read them
fine, but then I fear I can't read them at home.

/Morten

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