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disk space

Posted on 2004-09-09
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Last Modified: 2012-06-27
I'm trying to figure out how much disk space is on a network drive.  I have found several examples but none of them give me the correct size.

I used the info  obtained from this question:
http://www.experts-exchange.com/Programming/Programming_Languages/C_Sharp/Q_20747539.html?query=check+disk+space+and+C&clearTAFilter=true&showAll=true

The code gives me disk space info, but what I don't understand is the number don't match up at all.  The code says I had two drives a (C: and D:) which is correct, but then the code outputed that C: was 125GB and had 35GB free, the D: drive supposely was 23Gb drive with 11Gbs free.  None of this info is even closely correct.  C drive is a 20Gb drive with 13GB free and D drive is 450GB with 48GB free.  

I also tried this on several other network drives and my local drive...and I got the SAME INDENTICAL NUMBERS as stated a above.
Can some one shed some light on this subject.  What am I not seeing or not doing correctly????


Thanks!


CODE:

ConnectionOptions oConn = new ConnectionOptions();
long gb = 134217728; //gigabyte
 
System.Management.ManagementScope oMs = new System.Management.ManagementScope("\\\\na0029", oConn);    

//get Fixed disk stats
System.Management.ObjectQuery oQuery = new System.Management.ObjectQuery("select FreeSpace,Size,Name from Win32_LogicalDisk where DriveType=3");

//Execute the query  
ManagementObjectSearcher oSearcher = new ManagementObjectSearcher(oMs,oQuery);

//Get the results
ManagementObjectCollection oReturnCollection = oSearcher.Get();  
         
//loop through found drives and write out info
foreach( ManagementObject oReturn in oReturnCollection )
{
     // Disk name
     lw.WriteLine("Name : " + oReturn["Name"].ToString());
     // Free Space in bytes
     long ndiv = Convert.ToInt64(oReturn["FreeSpace"])/gb;
     lw.WriteLine("FreeSpace : " + ndiv.ToString());
     // Size in bytes
     ndiv = Convert.ToInt64(oReturn["Size"])/gb;
     lw.WriteLine("Size : " + ndiv);
}

OUTPUT:
Name : C:
FreeSpace : 35 GB
Size : 125 GB
Name : D:
FreeSpace : 11 GB
Size : 23 GB



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Question by:mrwhipple
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Accepted Solution

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NTAC earned 500 total points
ID: 12020389
Use this code:

************************
ConnectionOptions oConn = new ConnectionOptions();
double gb = 1073741824.0; //gigabyte
 
System.Management.ManagementScope oMs = new System.Management.ManagementScope("\\\\na0029", oConn);    

//get Fixed disk stats
System.Management.ObjectQuery oQuery = new System.Management.ObjectQuery("select FreeSpace,Size,Name from Win32_LogicalDisk where DriveType=3");

//Execute the query  
ManagementObjectSearcher oSearcher = new ManagementObjectSearcher(oMs,oQuery);

//Get the results
ManagementObjectCollection oReturnCollection = oSearcher.Get();  
         
//loop through found drives and write out info
foreach( ManagementObject oReturn in oReturnCollection )
{
     // Disk name
       Console.WriteLine("Name : " + oReturn["Name"].ToString());
       // Free Space in bytes
       double ndiv = Convert.ToInt64(oReturn["FreeSpace"])/gb;
       Console.WriteLine("FreeSpace : " + ndiv.ToString());
       // Size in bytes
       ndiv = Convert.ToInt64(oReturn["Size"])/gb;
       Console.WriteLine("Size : " + ndiv);
}

**********************

You choice of a gigabyte was wrong.  Also, use a double or a decimal so you can keep the decimal place.  You can change the formatting because it outputs 10 decimal places.

1 GB = 1024*1024*1024 (1 kilobyte = 1024 bytes).

Regards,
NTAC
0
 
LVL 1

Author Comment

by:mrwhipple
ID: 12021436
Thanks for the quick reply,

I get the right numbers when I test my local machine, but it seems when I try and access a network machine I get the same values.  Does this code not work when accessing a machine that is not locally?

Does the path matter?  the machine name is na0029, I get no errors when using it : (ie)
System.Management.ManagementScope oMs = new System.Management.ManagementScope("\\\\na0029", oConn);    
I've tried adding to the path: for example add the shared folder on to the path, but all that does is error out on the above line.


Thanks.

0
 
LVL 4

Expert Comment

by:NTAC
ID: 12021815
With my mapped drives, I can see them when I change the DriveType=4 (networked drives).  I'm not sure how your system is set up.  Do  you have a mapped drive to the other computer, or is it just a folder?  How is it set up?
0
 
LVL 1

Author Comment

by:mrwhipple
ID: 12022008
I have it setup as a mapped drive.

I get the info when I change my DriveType=4, excellent, is it possible to do it with out the drive being mapped?  Reason I asked is because this code will be part of a program that is on 200+ processing machines that are able to access 30+ network storage machines.  So it will be cumbersome if I have to map all the network storage machines on all 200+ machines!


Thanks.



   
0
 
LVL 4

Expert Comment

by:NTAC
ID: 12023363
mrwhipple

Now you are asking a different question.  I guess a way you could do it is to query the name of all computers on the network (or a list of them that you already know)--and then use the above code to retreive the local drive(s) on the system.  If you happen to know the setup of each of the storage systems, it might be a bit easier.

Regards,
NTAC
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