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Operating Systems Solaris EFI disk labeling / understand the parition table / sectors not continue Post 303028842 by javanoob on Wednesday 16th of January 2019 03:46:07 AM
Old 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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FDISK(8)						      System Manager's Manual							  FDISK(8)

NAME
fdisk - partition a hard disk [IBM] SYNOPSIS
fdisk [-hm] [-sn] [file] OPTIONS
-h Number of disk heads is m -s Number of sectors per track is n EXAMPLES
fdisk /dev/hd0 # Examine disk partitions fdisk -h9 /dev/hd0 # Examine disk with 9 heads DESCRIPTION
When fdisk starts up, it reads in the partition table and displays it. It then presents a menu to allow the user to modify partitions, store the partition table on a file, or load it from a file. Partitions can be marked as MINIX, DOS or other, as well as active or not. Using fdisk is self-explanatory. However, be aware that repartitioning a disk will cause information on it to be lost. Rebooting the sys- tem immediately is mandatory after changing partition sizes and parameters. MINIX, XENIX, PC-IX, and MS-DOS all have different partition numbering schemes. Thus when using multiple systems on the same disk, be careful. Note that MINIX, unlike MS-DOS , cannot access the last sector in a partition with an odd number of sectors. The reason that odd partition sizes do not cause a problem with MS-DOS is that MS-DOS allocates disk space in units of 512-byte sectors, whereas MINIX uses 1K blocks. Fdisk has a variety of other features that can be seen by typing h. Fdisk normally knows the geometry of the device by asking the driver. You can use the -h and -s options to override the numbers found. SEE ALSO
part(8). FDISK(8)
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