<br><br><div class="gmail_quote">On Sat, Jul 11, 2009 at 7:48 PM, Tim Watts <span dir="ltr"><<a href="mailto:timtw@earthlink.net" target="_blank">timtw@earthlink.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Hi,<br>
<br>
Just out of curiosity, why doesn't the reported total bytes on the drive<br>
divide evenly by the bytes/cylinder? Where would those extra bytes reside if<br>
not on a cylinder? And why isn't the total == 320GB? (I suppose the answer to<br>
the last question is tied up in the bad sector map. But how do they keep those<br>
out of the usable cylinder space? Or do they?)</blockquote><div><br>There are usually extra chunks of drive available to handle failing sections. That tends to throw off the numbers a bit. The total drive amount is in 1000 instead of 1024 units so the division gets bad. The actual space is a marketing scam. <br>
<br>An issue I have yet to be clear on myself is does the bits/cylinder change across the drive? The inner cylinders have less surface area than the outer cylinders. So maybe the bits/cylinder is also synthetic...<br>
</div><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><br>
<br>
And OK, I'm not afraid to look totally stupid (but I'll qualify my question by<br>
saying it's been /years/ since I've stuck my head inside a drive): Am I to<br>
believe that these drives, which can't be more than 3/4" high, /really/ have<br>
255 platters spinning inside them with an arm between each platter? Or has the<br>
geometry all been virtualized today? If you tightly stacked 255 crisp $1<br>
bills, do you know how high it would be? I don't, but I'm pretty sure it'd be<br>
more than 3/4"! (BTW, if you do know, you're spending way too much time at the<br>
strip clubs.)<br>
</blockquote><div><br>Every drive I've ever opened in the last 10 years had a single platter. I have not opened a SAS or newer SCSI drive yet. The really high throughput drives may actually have more platters/heads but I have yet to have the opportunity to ruin one with a screwdriver.<br>
<br> </div><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><br>
Thanks,<br>
Tim<br>
(who is awed by all this and just choc full o'questions)<br>
<br>
<br>
On Saturday 11 July 2009 5:28:22 pm Michael B. Trausch wrote:<br>
> On Sat, 11 Jul 2009, Brian Pitts wrote:<br>
> > Marc Ferguson wrote:<br>
> > > [root@fergatron ~]# fdisk -l /dev/sdb<br>
> >><br>
> >> Disk /dev/sdb: 320.0 GB, 320072933376 bytes<br>
> >> 255 heads, 63 sectors/track, 38913 cylinders<br>
> >> Units = cylinders of 16065 * 512 = 8225280 bytes<br>
> >> Disk identifier: 0x0b99f72f<br>
> >><br>
> >> Device Boot Start End Blocks Id System<br>
> >> /dev/sdb1 1 38913 312568641 83 Linux<br>
> >> [root@fergatron ~]#<br>
> >><br>
> >> I'm not fully comprehending these outputs. Do they indicate anything of<br>
> >> significance?<br>
> ><br>
> > That looks like one (roughly) 320 GB partition to me. You could try to<br>
> > grow the filesystem by running the following as root<br>
> ><br>
> > umount /dev/sdb1<br>
> > e2fcsk -f /dev/sdb1<br>
> > resize2fs -p /dev/sdb1<br>
> > mount /dev/sdb1 /media/backup<br>
><br>
> If the kernel is recent enough, and the filesystem is extXfs, it should be<br>
> growable online.<br>
><br>
> --- Mike<br>
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