bootable ext. USB SSD for backup

[Polytropon]

On Thu, 16 Mar 2017 21:37:22 +0100, Ralf Mardorf via freebsd-questions wrote:
> On Thu, 16 Mar 2017 21:11:53 +0100, Martin S. Weber wrote:
> >Toshiba is clearly underselling the  disk.
> 
> I don't think so, I suspect that some bytes are reserved to compensate
> borked memory locations.

Few years ago, I read that SSDs that are sold with size n are
actually produced as size 2 * n due to high failure rate during
production...

The 1000 vs. 1024 factor problem aside, it might also be that
marketing TB are calculated with "Windows" file system overhead
in mind (actually usable for user files vs. occupied disk space
with FS data, metadata, directories, and actual files).



> GParted mentions 223.57 GiB * 1024 * 1024 = 234,430,136.32 bytes.
> MBR, file system entries might take some space, too. OTOH the complete
> capacity shouldn't shrink ;).

It's a _magical_ disk where data loss leads to more usable disk
space for user files. ;-)


-- 
Polytropon
Magdeburg, Germany
Happy FreeBSD user since 4.0
Andra moi ennepe, Mousa, ...