Hi,
I need some education on how parted is doing math. ;-)
The drive is 1 TB.
# parted /dev/rdsk/c7t1d0p0
GNU Parted 2.3.0
Using /dev/rdsk/c7t1d0p0
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) unit cyl
unit cyl
(parted) p
p
Model: Generic Ide (ide)
Disk /dev/rdsk/c7t1d0p0: 121601cyl
Sector size (logical/physical): 512B/512B
BIOS cylinder,head,sector geometry: 121601,255,63. Each cylinder is 8225kB.
Partition Table: gpt
Number Start End Size File system Name Flags
1 0cyl 121600cyl 121600cyl zfs
9 121600cyl 121601cyl 1cyl
*
Question 1)*
Based on the parted value 8225KB per cylinder, I would think that
sectors per cylinder could be calculated thus
8225 KB/cyl * 1024 Bytes/KB = 8422400 Bytes/cyl
and 8422400 Bytes/cyl / 512 Bytes/sector = 16450 sectors per cylinder
However, I would also think that sectors per cylinder could be
calculated thus:
255 * 63 = 16065 sectors per cylinder
Obviously these numbers do not match.
Just for the heck of it, in case when parted says 1 KB it means 1,000
bytes not 1,024 bytes, I did this math.
8225 * 1000 = 8225000 / 512 = 16064.4531 sectors per cylinder
which is certainly closer to the value you get from 255 * 63 but it
really doesn't make any sense to me to be thinking that we are getting a
fractional number of sectors in a given cylinder.
Thanks for your insight.
