bootable ext. USB SSD for backup

[Valeri Galtsev]

On Thu, March 16, 2017 2:46 pm, Matthias Apitz wrote:
>
> Hello,
>
> I have acquired a small and flat USB 3.0 external disk (must be SSD for
> the size of the case):
>
> Mar 16 19:36:54 c720-r314251 kernel: da0: <TOSHIBA External USB 3.0 5438>
> Fixed Direct Access SPC-4 SCSI device
> Mar 16 19:36:54 c720-r314251 kernel: da0: Serial Number 20170114010787F
> Mar 16 19:36:54 c720-r314251 kernel: da0: 40.000MB/s transfers
> Mar 16 19:36:54 c720-r314251 kernel: da0: 953869MB (1953525164 512 byte
> sectors)
> Mar 16 19:36:54 c720-r314251 kernel: da0: quirks=0x2<NO_6_BYTE>
>
> Ofc it has not the promised 1 TB volume, just only 953869 MB, i.e. only
> 1 Marketing-TB;

It may have to do with counting by power of 10 instead of power of 2 (Not
exactly correct, but close). Which remind me an old joke:

Do you know the difference between junior programmer and senior programmer?

Junior programmer faithfully thinks that one kilobyte is exactly 1000 bytes.

Senior programmer faithfully thinks that one kilogram is exactly 1024 grams.

Valeri

>
> I'm thinking in re-partitioning the disk (which is actual only one big
> NTFS slice) with gpart(8), install even a kernel into a small FS at the
> beginning and keep the rest as a big UFS for backups. Having it bootable
> with a system could be handy if one has to rescue a system and restore
> the last dunp.
>
> Any ideas/comments
>
> 	matthias
> --
> Matthias Apitz, ✉ guru at unixarea.de, ⌂ http://www.unixarea.de/  ☎
> +49-176-38902045
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++++++++++++++++++++++++++++++++++++++++
Valeri Galtsev
Sr System Administrator
Department of Astronomy and Astrophysics
Kavli Institute for Cosmological Physics
University of Chicago
Phone: 773-702-4247
++++++++++++++++++++++++++++++++++++++++