Hi,
After reading the man pages for fdisk, disklabel and the FAQ, I created
a FFS2 filesystem on my 1TB usb harddisk (which I want to use for
backups). The disk contains an OpenBSD MBR partition which spans
the entire disk. I issued the following commands:
# fdisk -i sd0
# disklabel -E sd0
(created partition 'a' covering the whole OpenBSD part)
# newfs -O 2 sd0a
This works fine, however only 931GB of the disk is allocated, while
originally it was capable of storing 1000GB (FAT filesystem).
Since an additional 5% is reserved for root, df -h tells me there is
just 878GB available.
Where has the remaining diskspace gone?
# fdisk sd0
Disk: sd0 geometry: 121601/255/63 [1953525168 Sectors]
Offset: 0 Signature: 0xAA55
Starting Ending LBA Info:
#: id C H S - C H S [ start: size ]
-------------------------------------------------------------------------------
0: 00 0 0 0 - 0 0 0 [ 0: 0 ] unused
1: 00 0 0 0 - 0 0 0 [ 0: 0 ] unused
2: 00 0 0 0 - 0 0 0 [ 0: 0 ] unused
*3: A6 0 1 2 - 121600 254 63 [ 64: 1953520001 ] OpenBSD
# disklabel sd0
# /dev/rsd0c:
type: SCSI
disk: SCSI disk
label: Bell Carbon
duid: bd112d36e9fc8c1f
flags:
bytes/sector: 512
sectors/track: 63
tracks/cylinder: 255
sectors/cylinder: 16065
cylinders: 121601
total sectors: 1953525168
boundstart: 64
boundend: 1953520065
drivedata: 0
16 partitions:
# size offset fstype [fsize bsize cpg]
a: 1953525056 64 4.2BSD 8192 65536 1
c: 1953525168 0 unused
# df -h
Filesystem Size Used Avail Capacity Mounted on
/dev/sd0a 924G 199G 679G 23% /mnt/sd0a
Best,
Erwin
