01-14-2012
I'd say this is inconclusive. Could be a bad spot in a very unfortunate location (the partition/slice table), or could be poorly defined partition start/end points causing the corrupted partition to have been overwritten with data from the adjacent partition. You still need to look at output from an fdisk like tool to ensure that there isn't any overlap (if there is you've likely got much more corruption than what you've found). If there isn't overlap, then my guess would be a bad spot on the disk.
I'm not an expert when it comes to hard disk issues, maybe someone else with a bit more savvy will chime in and lend some help.
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LEARN ABOUT OPENDARWIN
fixadd
fixadd(3alleg4) Allegro manual fixadd(3alleg4)
NAME
fixadd - Safe function to add fixed point numbers clamping overflow. Allegro game programming library.
SYNOPSIS
#include <allegro.h>
fixed fixadd(fixed x, fixed y);
DESCRIPTION
Although fixed point numbers can be added with the normal '+' integer operator, that doesn't provide any protection against overflow. If
overflow is a problem, you should use this function instead. It is slower than using integer operators, but if an overflow occurs it will
set `errno' and clamp the result, rather than just letting it wrap. Example:
fixed result;
/* This will put 5035 into `result'. */
result = fixadd(itofix(5000), itofix(35));
/* Sets `errno' and puts -32768 into `result'. */
result = fixadd(itofix(-31000), itofix(-3000));
ASSERT(!errno); /* This will fail. */
RETURN VALUE
Returns the clamped result of adding `x' to `y', setting `errno' to ERANGE if there was an overflow.
SEE ALSO
fixsub(3alleg4), fixmul(3alleg4), fixdiv(3alleg4)
Allegro version 4.4.2 fixadd(3alleg4)