Re: FDisk Help
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On Thu, Jan 07, 2016 at 08:29:46AM +0100, Sven Hartge wrote:
> Steve Matzura <sm@noisynotes.com> wrote:
>
> > I have three physical drives in my system--/dev/sda is presumably my
> > boot drive, which shows up as six devices in /dev:
> > /dev/sda1,2,5,6,7,8. Additionally, there's a CD-ROM drive, and a 250GB
> > standard rotating disk. My boot partition is located on a 120GB SSD,
> > which I presume is /dev/sda, is divided as follows according to df:
>
> > Filesystem 1K-blocks Used Available Use% Mounted on
> > /dev/sda1 8518920 879012 7184128 11% /
> > /dev/sda7 368615 2058 343005 1% /tmp
> > /dev/sda5 2817056 178752 2475488 7% /var
> > /dev/sda8 89493696 57076 84867532 1% /home
>
> > What, then, are /dev/sda2 and /dev/sda6? I tried looking at them with
> > FDisk and got the following:
>
> > For /dev/sda2: Failed to read extended partition table
> > (offset=5858805): Invalid argument
>
> > For /dev/sda6: device contains a valid 'swap' signature, it's strongly
> > recommended to wipe the device by command wipefs(8) if this setup is
> > unexpected to avoid possible collisions.
>
> /dev/sda5 to /dev/sda8 are logical partitions inside an extended
> partition. The extended partition is /dev/sda2.
Exactly. That's the vagaries of the old "DOS" partition schema.
Originally the partition table only provided room for up to four
partitions. Once that became too tight, we cludged our way out
by allowing one of those four (the so-called "extended" partition
to be subdivided into further four so-called "logical" partitions.
The old, "real" partitions came to be known henceforth as "primary"
partitions.
That's why df doesn't "see" it: no file system on it.
As for /dev/sda6: df only "sees" mounted file systems, no swap.
Thus if you want to have a more complete view of what's going on
in your disk, then yes, fdisk -l is more appropriate, as jdd wrote.
You've to aim it at the "right" disk, though, and you usually have
to be root. For a first approximation df is fine, if you know how
to interpret the (incomplete) results.
regards
- -- tomás
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