01-16-2019
Quote:
Originally Posted by
jlliagre
fdisk is reporting 512 bytes sectors but nowadays, disks have 4096 bytes sectors.
The discrepancy between the available size (1172107117 x 512 bytes sectors) and the amount actually used (1172107151 x 512 bytes sectors) is 34 sectors, i.e. 4.25 (sic) actual sectors.
So you have 0.0000029 % of the disk unusable due to rounding errors. No big deal.
Hi jlliagre,
Thanks for taking this up.
q1) what do you mean by "4.25 (sic) actual sectors." ? Where the 4.25 ?
q2) 1172107151 > did you count from 0 to 1172107150 ? (as the partition starts from 256 -> probably due to alignment set by Oracle)
Regards,
Noob
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DISKTAB(5) File Formats Manual DISKTAB(5)
NAME
disktab - disk description file
SYNOPSIS
#include <disktab.h>
DESCRIPTION
Disktab is a simple date base which describes disk geometries and disk partition characteristics. The format is patterned after the term-
cap(5) terminal data base. Entries in disktab consist of a number of `:' separated fields. The first entry for each disk gives the names
which are known for the disk, separated by `|' 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.
Name Type Description
ns num Number of sectors per track
nt num Number of tracks per cylinder
nc num Total number of cylinders on the disk
b0 str Filename of block zero primary bootstrap for device
ba num Block size for partition `a' (bytes)
bd num Block size for partition `d' (bytes)
be num Block size for partition `e' (bytes)
bf num Block size for partition `f' (bytes)
bg num Block size for partition `g' (bytes)
bh num Block size for partition `h' (bytes)
fa num Fragment size for partition `a' (bytes)
fd num Fragment size for partition `d' (bytes)
fe num Fragment size for partition `e' (bytes)
ff num Fragment size for partition `f' (bytes)
fg num Fragment size for partition `g' (bytes)
fh num Fragment size for partition `h' (bytes)
pa num Size of partition `a' in sectors
pb num Size of partition `b' in sectors
pc num Size of partition `c' in sectors
pd num Size of partition `d' in sectors
pe num Size of partition `e' in sectors
pf num Size of partition `f' in sectors
pg num Size of partition `g' in sectors
ph num Size of partition `h' in sectors
se num Sector size in bytes (default 512)
sf bool supports bad144-style bad sector forwarding
so bool partition offsets in sectors
ty str Type of disk (e.g. removable, winchester)
Disktab entries may be automatically generated with the diskpart program.
FILES
/etc/disktab
SEE ALSO
newfs(8), diskpart(8), getdiskbyname(3)
BUGS
This file shouldn't exist, the information should be stored on each disk pack.
4.2 Berkeley Distribution May 17, 1986 DISKTAB(5)