Disk Partition Interpretetion

[williemercedes]

Hello Forum:

I have this partition:

Disk /dev/sdf: 96.6 GB, 96636764160 bytes
255 heads, 63 sectors/track, 11748 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

Device Boot Start End Blocks Id System
/dev/sdf1 1 11749 94371808+ 83 Linux

When I try to find the partition's space, I get nothiing:

bash disk_space.sh /dev/sdg
Partition:
Total size:
Used space:
Free space:

Where disk_space.sh is a script that provides the output above. For example, on this partition:

Disk /dev/sda: 73.0 GB, 72999763968 bytes
255 heads, 63 sectors/track, 8875 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00058792

Device Boot Start End Blocks Id System
/dev/sda1 * 1 64 512000 83 Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2 64 8876 70775808 8e Linux LVM

I get this info out of the script:

Partition: /dev/sda1
Total size: 485M
Used space: 40M
Free space: 420M

Can anyone tell me why I do not get a similar result from the /dev/sdg partition?

Can someone tell me what this means?

Thanks.

[mizzle]

/dev/sdf is a block device (hdd most likely)
/dev/sdf1 is a partition on /dev/sdf

Note, you wrote "bash disk_space.sh /dev/sdg" as opposed to /dev/sdf1

[williemercedes]

Correct, /dev/sdf is a block device and /dev/sdf1 is a partition. However, what I do not understand is why I dont get why I don't get its total size, used space, and free space when I run the script:

#!/bin/sh

#run as: bash disk_space.sh /dev/sda,
#where /dev/sda is the name of the disk.

DISC=$1
PARTITION=`df -h | grep $DISC | awk '{print $1}'`
SIZE=`df -h | grep $DISC | awk '{print $2}'`
USED=`df -h | grep $DISC | awk '{print $3}'`
FREE=`df -h | grep $DISC | awk '{print $4}'`

echo "Partition: $PARTITION"
echo "Total size: $SIZE"
echo "Used space: $USED"
echo "Free space: $FREE"

When I run the script on another partition, I get those results:

[w@b scripts.d]$ bash disk_space.sh /dev/sda
Partition: /dev/sda1
Total size: 485M
Used space: 40M
Free space: 420M
[w@b scripts.d]$

[nikhil_shinde1]

Hi,

As discussed above
your hard disk - /dev/sdf
hard disk partition is - /dev/sdf1 in ext3 file format as id is 83
block size is - 512 bytes

When you run the bash script as { bash disk_space.sh /dev/sda }
your input is /dev/sda will match all partition starting with /dev/sda{1,2,3,4,5} but will not include /dev/sdf

run the script as { bash disk_space.sh /dev/sd }
will match /dev/sda1 & /dev/sdf1

Regards,
Best Wishes