DragonFly users List (threaded) for 2005-03
Re: SATA problem
Jason M. Leonard wrote:
On Thu, 31 Mar 2005, Bill Hacker wrote:
Jaime Andrés Ballesteros wrote:
Ok Bill, thanks for your answer. My SATA is a Seagate 7200.7 with
120 GB. FreeBSD 5.3 doesn't recognize the geometry of my disk.
FreeBSD force me to input another geometry and gives me 114 GB
and i think this cause the problem.
Nope. That is about all you will get. Working with a pair of
Western Digital 120 GB PATA the last 2 days, get about 114.4 GB
with either FreeBSD or DFLY. 200 GB Maxtors, PATA or SATA give me
about 190 GB or so.
Few HDD can (or should) give you 100% of the theorecticaly
For marketing purposes 1G == 1000M, so with (120 x 1000)/1024 we're
looking at a theoretically available area of 117G. No one really
makes 120G (117G) or 200G (195G) hard drives.
Yes and 'not quite'.
Look at the slices and note that there is 'unused' (and unusable)
space showing. Drives will reserve space for a pool of replacements for
bad blocks. An OS will reserve a bit more.
Put the SCSI variant of any of the above on a sophisticated SCSI RAID
controller and use it unformated as a raw block device - the best way
for true hot-swap, wherein the MBR and partition table are stored in the
controller's NVRAM. You can get a lot closer to the published capacity.
But such controllers are far and away more expensive than the miniscule
extra space one might gain. That's not why you buy them.