Scandisk or defrag fail to recognize hd volume

Question

hello all, and happy holidays.
i've had this issue b4 but didnt pay too much attention to it, but now it has happened again so i am a bit bothered.
i have seagate 7200.7 120GB sata drive with ncq hooked to the nvidia sata controller #2.
The drive has 8 volumes (c-j), c,d,e,g,h are ntfs, the others fat32.
Sometime when my computer hangs and i've to reset it, scandisk fails to recognize some volumes (totally random this time f,i, always fat32) as valid win xp volumes.
I can still open these volumes and read and write to them, but cant run defrag (i use disk keeper pro) on them, or for that matter anyother hdd tools like windows scandisk etc.
Now when ever i reboot, scandisk kicks in complaining that it cant scan non-xp drives.
My options include turning off scandisk, reformatting (loads of data on them, really not a good option), find out whats causing it!!
So anyone here help me work on option three 
Rest of the system is in the signature.
thanks.

Answer 1

4184
Hello again tcdm1972,
This quote from a MicroMat technician is misleading and makes me wonder about abusingly promoting defragmentation (and using their products) as so necessary.
Yes, in certain rare cases one might benefit from defragmenting HD and HD free space, but in Mac OS X it is not so black and white question.
- In the more general usage of Mac OS X, defragmentation is actually counter-productive and defeats the very clever way Mac OS X has to rewrite every file on-the-fly onto the best possible location at this very moment, each time an application uses it.
Best location on the hard drive varies, depending on many more criteria than the simple contiguity.
About the term "optimization" in Apple software installs:
I find it misleading too, as all it optimizes is the launching of applications in Mac OS X
(it's the "update_prebinding" command really, nothing to do with defragmentation).
About OnyX, Yasu etc:
These too are small utilities to run quite harmless Terminal commands. They don't play in the same fields, nothing neither to do with defragmentation.
DiskWarrior too has yet another approach: Directory handling.
So, your original question about using iDefrag:
On their website they state
"To defragment your boot volume, you need to boot from a different volume"
as I said.
In your case, the solution is clear:
since you have two boot partitions on your HD,
- boot from Partition 1 to defrag Partition 2,
and
- boot from Partition 2 to defrag Partition 1.
That is, a copy of iDefrag installed on each of your Mac OS X volumes.
Axl