Thanks, Werner; but,

That is the explanation by KK that I don't understand:
1. Would Reiserfs be a good idea as well for LiveUSB?
2. If so, why aren't we using it now?
3. For the 'usual' crashed LiveUSB should one try a fsck to repair it?
4. In case 3, I've alway just burned a new copy & brought it up-to-date
with a backup of home/, etc/ and 'syslinux.cfg

What is KK saying here, anyway?
I was hoping fmateo (or anyone) had an explanation I could understand.
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Also, in my post #4 here, the units are MB/s not Mb/s.
B/s are 8 b/s, in SanDisk documentation. I have the feeling that
the USB is not slowing things down, but I'm not sure of the math.