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Special Forums Hardware Filesystems, Disks and Memory Calculating Drive Space Increase Post 302189376 by JTalbot017 on Friday 25th of April 2008 03:12:27 PM
Old 04-25-2008
Error Calculating Drive Space Increase

I trying to calculate drive space with RAID. I know the equation is:
(n-1)/n * drive capacity

but, when I use that my calculations don't come out when I compare to what I already know exists:
I have 3 - 18.2gb SCSI drives that contain two logical drives C & D.
Using the math, (3-1)/3 * 18.2 = 12.1gb usable space per drive.

C has: 9.76gb
D has: 24.1gb

Drive D works out just fine but the C drive should have 12.1gb usable. I am so confused.

I need to know how to get the right numbers because my boss wants to know how much gain would come from intalling two additional 18.2gb drives.

Is there something I am missing?? I have researched 'til my eyes hurt because until a week ago, I haven't had to deal with calculating hard drive upgrades and such since my first year of college. HELP!!
 

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SDL_CDOpen(3)							 SDL API Reference						     SDL_CDOpen(3)

NAME
SDL_CDOpen - Opens a CD-ROM drive for access. SYNOPSIS
#include "SDL.h" SDL_CD *SDL_CDOpen(int drive); DESCRIPTION
Opens a CD-ROM drive for access. It returns a SDL_CD structure on success, or NULL if the drive was invalid or busy. This newly opened CD- ROM becomes the default CD used when other CD functions are passed a NULL CD-ROM handle. Drives are numbered starting with 0. Drive 0 is the system default CD-ROM. EXAMPLES
SDL_CD *cdrom; int cur_track; int min, sec, frame; SDL_Init(SDL_INIT_CDROM); atexit(SDL_Quit); /* Check for CD drives */ if(!SDL_CDNumDrives()){ /* None found */ fprintf(stderr, "No CDROM devices available "); exit(-1); } /* Open the default drive */ cdrom=SDL_CDOpen(0); /* Did if open? Check if cdrom is NULL */ if(!cdrom){ fprintf(stderr, "Couldn't open drive: %s ", SDL_GetError()); exit(-1); } /* Print Volume info */ printf("Name: %s ", SDL_CDName(0)); printf("Tracks: %d ", cdrom->numtracks); for(cur_track=0;cur_track < cdrom->numtracks; cur_track++){ FRAMES_TO_MSF(cdrom->track[cur_track].length, &min, &sec, &frame); printf(" Track %d: Length %d:%d ", cur_track, min, sec); } SDL_CDClose(cdrom); SEE ALSO
SDL_CD, SDL_CDtrack, SDL_CDClose SDL
Tue 11 Sep 2001, 22:58 SDL_CDOpen(3)
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