On Mon, May 19, 2008 at 6:18 AM, Adil Mujeeb <mujeeb.adil@xxxxxxxxx> wrote: > On 5/19/08, Michael Blizek <michi1@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote: >> On 07:55 Sun 18 May , Robert P. J. Day wrote: >> > >> > possibly slightly off-topic, but i've been handed (not at hand at >> > the moment, though) an embedded system running 2.4.26, which has a >> > bunch of flash-based partitions corresponding to the device files >> > /dev/scsi/host-?/bus0/target0/lun0/part-?. >> > >> > what i want is a quick way to determine the size in bytes of those >> > partitions. will there be entries for them in /proc/partitions? is >> > there a better way? they won't necessarily be mounted; in fact, they >> > probably won't be. thoughts? thanks. >> >> cat /sys/block/hda/hda1/size >> -Michi >> -- > > it display the data in which unit? > On my system, the output is as follows:- > > adil@localhost:~> df -h > Filesystem Size Used Avail Use% Mounted on > /dev/sda1 10G 4.7G 5.3G 47% / > udev 466M 208K 466M 1% /dev > /dev/sda5 43G 14G 27G 35% /home > /dev/sda7 20G 7.1G 12G 39% /home1 > > adil@localhost:~> cat /sys/block/sda/sda1/size > 20900502 > adil@localhost:~> cat /sys/block/sda/sda5/size > 91570437 > > These outputs are not matching with the first one. > Am I missing anything?? > The native data transfer size for a disk drive is sectors. When you ask for -h you get sizes that you like, but it is foreign to the disk itself. >From a physical disk perspective, talking about bytes is like talking about bits when discussing ram. It can be done, but it does not match the inherent layout of the media. ie. I don't believe disks even support sub-sector transfers. If you want to modify half a sector, you have to do a read/modify/write sequence. Very much like working with bits in ram. Greg -- Greg Freemyer Litigation Triage Solutions Specialist http://www.linkedin.com/in/gregfreemyer First 99 Days Litigation White Paper - http://www.norcrossgroup.com/forms/whitepapers/99%20Days%20whitepaper.pdf The Norcross Group The Intersection of Evidence & Technology http://www.norcrossgroup.com -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
