Hard drive memory missing

I have a Mac Book Pro. It has been running very slowly so been checking the amount of memory available. Get info shows 277GB being used out of 319GB. Daisy disk sofatware showing the same. In both cases though if I dig deeper into each of the sub folders, the content does not add up to more than 200GB.
How can there be such a gap? Should I defragment the drive, is this the problem?
Not the first time I have had this. Had the same issue a few months back on our iMac but then it got stolen when we were burglared so never ended up solving the issue.
Help really appreciated.
Frederique

So far, so good.
As verification, go to Apple (icon)/About this Mac/More Info, and tap on Storage. Disk should show "xxGB free out of xxGB". The second number will be your full hard drive capacity. According to your post, you have 277GB of 319GB.
I don't know your model, but it looks like you have a 320GB capacity. If that's so, your drive is perfectly normal. Disk Utility indicates your drive is fine.

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I have been unable to locate a solution to my current problem. Recently I was attempting to use the disc utility application to erase an external 160GB Maxtor drive and accidentally erased on of my existing internal HD icons from my desktop. I am now unable to find or access the "missing" HD anywhere. However, I do have use of the other HD which uses the Jaguary 10.3.9 OS.
Basically the "missing" drive was initially a clone of main drive as was programmed by Apple when I purchased back in 2004. However, I had upgraded to Mac OS X Tiger along with Final Cut Studio and the included applications of Final Cut Pro, Motion, Soundtrack Pro, Compressor, and DVD Studio Pro. Thankfully, I did not have any saved projects, music or documents that I would need to worry about recovering. Also, I should have all of the install application discs at home as I would assume that I will need to use them at some point. If possible, in attempting to correct this problem I would rather not jeopardize the info that is on the remaining "good" drive. Do you have any suggestions regarding starting from scratch on the "bad" hard drive? Obviously, I am a "rookie" at this but I would appreciate any assistance that you may have to offer in order to get this hard drive back to the point that it was at prior to my big "mistake"!!!
The drives are both internal as shown by info from my System Profiler that I've copied/pasted below:
ATA Bus:
Name: k2-sata
Maxtor 6Y250M0:
Capacity: 233.76 GB
Model: Maxtor 6Y250M0
Revision: YAR51FW0
Serial Number: Y634JGZE
Removable Media: No
Detachable Drive: No
BSD Name: disk0
Protocol: ATA
Unit Number: 0
Socket Type: Serial ATA
bay_name: A (upper)
OS9 Drivers: No
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Writable: Yes
File System: Journaled HFS+
BSD Name: disk0s3
Mount Point: /
ATA Bus:
Name: k2-sata
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Capacity: 233.76 GB
Model: Maxtor 6Y250M0
Revision: YAR51FW0
Serial Number: Y634JJ6E
Removable Media: No
Detachable Drive: No
BSD Name: disk1
Protocol: ATA
Unit Number: 0
Socket Type: Serial ATA
OS9 Drivers: No
bay_name: B (lower)
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Thank you in advance for any help or guidance you may have to offer! I also appreciate your taking time out of your day to try and solve this issue.
Johnny
Thanks again!

Here's the answer to this question as provided by EWW in another Discussion Forum from mid-September 2007.
Re: HD ICON DISAPPEARED FROM BOTH DESKTOP & DISK UTILITY
Okay, so you have two identical 250GB Maxtor internal drives, and both drive mechanisms are recognized by System Profiler — but the second one now has no volume(s) on it. The first one contains a single volume called Macintosh HD, about which some information is reported under its name. It appears that both drives are connected satisfactorily to the logic board, so cabling and connections aren't at fault. The external drive isn't involved either, and if it's still connected I suggest disconnecting it before doing anything further, just so it won't get mixed up in the fray.
A volume is not the drive itself; it's a data storage structure on the drive that you create and name when you format and partition the drive. There can be just one volume on a drive, or more than one. If you create two or more partitions, each partition is a volume, and appears as a separate disk icon on the desktop after formatting is done.
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Hi Zeid Mohamedali: Perfectly normal numbers for a hard drive. Check out this Apple article for the explanation. http://docs.info.apple.com/article.html?artnum=30065
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I recommend you take a look at this freeware that it is very easy to use and it will show you exactly what is taking up your space.
Then you can choose to delete things if you see they are doubled.
http://www.id-design.com/software/whatsize/index.php
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The 'shrinkage' is due to the system using HD space as virtual memory. That is the reason why you should always leave a good chunk of disk space available for the system to use (depending on how much RAM you have and what sort of work you're using it for, that could be anything from 5 - 20GB or more).
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Thank you for info!

Once on TM Pref Pane, click on Options to see exclusions...
From reading online it appears that a lot can go wrong in that process
Just Verifying will do no harm, but will tell us if there's a problem with either Disk.
what that means and how that could find or free up the 60 GB I am missing.
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Hard drive memory missing

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