Why are you opening and closing the file every time you do something?
This especially becomes useless:
Code:
/**
Seek out a Particular Block In the Disk
Block_SIZE=512bytes
*/
int seekDisk()
{
cout<<"Seeking the File Disk..."<<endl;
int fd=open(DISK_NAME, O_RDWR);
if(lseek(fd, 0L, SEEK_SET) != 0L)
{
perror("Couldn't seek");
close(fd);
return(1);
}
close(fd);
return 0;
}
...because the seek position gets reset every time you open it anyway. You should open it once and keep using the number it gives you. Your read code would end up looking like int readFromDisk(int fd, char *buffer,int length) { ... } iow exactly like normal read...so you might as well get used to ordinary read call instead.
You should also be doing something more with the number of bytes written and read than just printing it. read() and write() will occasionally surprise you with less than you asked for.
Hi all
I am facing a strange problem.
I am using a sun ultra10 spark machine.
first i took a 20gb IDE hard disk and installed solaris 5.8.
But due to some requirement i have to reinstall the OS but this time solaris 2.6.
and now the hard disk capacity is only showing 8gb.
Where the 12gb... (3 Replies)
I had an issue with a second hard disk in my machine. I have a sparc station running solaris 7. It was working fine but now it wont mount on boot up and when you try to mount it manually it gives an I/O error. I tried a different disk as a control which was fine. What I want to know is if my... (3 Replies)
:eek: I use this Solaris to run CMS a call acounting software package for my job. No one could run reports today because it said the this when you logged on
"The following file systems are low, and could adversely affect server performance:
File system /: 99%full"
Can some one please explain... (9 Replies)
Hi guys i have created a linux machine in virtual box now i want to add some hard disk space into it.
How would i do this.
Please help.
Machine details are as below
# lsb_release -a
LSB Version: :core-3.1-ia32:core-3.1-noarch:graphics-3.1-ia32:graphics-3.1-noarch
Distributor ID:... (7 Replies)
hi
I've a fresh installation of SCO 5.0.7 on the IDE hard disk.
For SCSI hard disk I can declare, for example blc disk driver using:
# mkdev hd 0 SCSI-0 0 blc 0but it works for IDE hard disk? (3 Replies)
When we write a programme,we declare variables and compiler allocates memory to them.I want to get access to the physical block number of hard-disk where actually the data is stored by the programme "
Some one help me out... (1 Reply)
When we write a programme,we declare variables and compiler allocates memory to them.I want to get access to the physical block number of hard-disk where actually the data is stored by the programme "
Some one help me out... (3 Replies)
Discussion started by: nagraz007
3 Replies
LEARN ABOUT OSF1
disktab
disktab(4) Kernel Interfaces Manual disktab(4)NAME
disktab - Disk description file
SYNOPSIS
#include <sys/disklabel.h>
DESCRIPTION
The disktab database describes disk geometries and disk partition characteristics. It is used to initialize the disk label on the disk.
The format is patterned after the termcap terminal database. Entries in a disktab file consist of a number of : (colon) separated fields.
The first entry for each disk gives the names which are known for the disk, separated by | (vertical bar) characters. The last name given
should be a long name fully identifying the disk.
The following list indicates the normal values stored for each disk entry: Type Description str Type of disk (for example, removable, win-
chester) str Type of controller (for example, SMD, ESDI, floppy) num Number of sectors per track num Number of tracks per cylinder
num Total number of cylinders on the disk num Number of sectors per cylinder, nc*nt default num Number of sectors per unit, sc*nc
default num Sector size in bytes, DEV_BSIZE default bool Controller supports bad144-style bad sector forwarding num Rotation speed,
rpm, default 3600 num Sector skew per track, default 0 num Sector skew per cylinder, default 0 num Headswitch time, usec, default 0
num One-cylinder seek time, usec, default 0 num Sector interleave (n:1), default 1 num Drive-type-dependent parameters num Boot block
size, default BBSIZE num Superblock size, default SBSIZE num Block size for partition `a' (bytes) num Block size for partition `d'
(bytes) num Block size for partition `e' (bytes) num Block size for partition `f' (bytes) num Block size for partition `g' (bytes)
num Block size for partition `h' (bytes) num Fragment size for partition `a' (bytes) num Fragment size for partition `d' (bytes)
num Fragment size for partition `e' (bytes) num Fragment size for partition `f' (bytes) num Fragment size for partition `g' (bytes)
num Fragment size for partition `h' (bytes) num Offset of partition `a' in sectors num Offset of partition `b' in sectors num Offset of
partition `c' in sectors num Offset of partition `d' in sectors num Offset of partition `e' in sectors num Offset of partition `f' in
sectors num Offset of partition `g' in sectors num Offset of partition `h' in sectors num Size of partition `a' in sectors num Size of
partition `b' in sectors num Size of partition `c' in sectors num Size of partition `d' in sectors num Size of partition `e' in sectors
num Size of partition `f' in sectors num Size of partition `g' in sectors num Size of partition `h' in sectors str Partition type of
partition `a' (4.2BSD file system, swap, etc.) str Partition type of partition `b' str Partition type of partition `c' str Parti-
tion type of partition `d' str Partition type of partition `e' str Partition type of partition `f' str Partition type of partition `g'
str Partition type of partition `h'
EXAMPLES
The following is an example disktab entry:
rz25|RZ25|DEC RZ25 Winchester:
:ty=winchester:dt=SCSI:ns#62:nt#9:nc#1492:
:oa#0:pa#131072:ba#8192:fa#1024:
:ob#131072:pb#262144:bb#8192:fb#1024:
:oc#0:pc#832527:bc#8192:fc#1024:
:od#393216:pd#146437:bd#8192:fd#1024:
:oe#539656:pe#146437:be#8192:fe#1024:
:of#686096:pf#146437:bf#8192:ff#1024:
:og#393216:pg#439311:bg#8192:fg#1024:
:oh#0:ph#0:bh#8192:fh#1024:
FILES
/etc/disktab
RELATED INFORMATION
Functions: getdiskbyname(3)
Files: disklabel(4)
Commands: disklabel(8), newfs(8) delim off
disktab(4)