Maxim S. Shatskih wrote: 
>
> Yes.

Yes but it must be added, the question itself seems to reveal a lack of
understanding. True, Unix (what's a *NIX anyway?) directory entries have
this limitation but that's like saying potatoes will fall if you drop
them from a tower - yes, and so will anything else. All directory
entries, Unix or not, are inherently limited to references within their
own filesystem, just as pointers in a program cannot point into another
program's address space and a table in a relational database cannot
contain data from another database. These are not quirks of
implementation; they are requirements of reality.

And BTW, in the Unix world at least, the terms "volume", "partition",
"drive", and "filesystem" refer to potentially divergent things.
Directory entries can point only within their _filesystem_; the volume
is something else again.

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