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Re: Using USB Flash / Pendrives or [micro]SD cards for backup

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On 18.03.2019 18:30, rhkramer@gmail.com wrote:
> Is anyone (reading this list) using USB Flash / Pendrives or [micro]SD cards 
> for backup?
>
> I've thought about doing that, especially as they continue to come down in 
> price, but my experience with them  at least in some cases has not been good.
>
> The worst case seems to be dash cams where, after about a year or so they just 
> stop working, but I've had at least one similar case using them for data 
> storage.
>
I would never consider these mediums to hold any important backups.
There are some reasons why they are cheap.
Mainly because they utilize cheap to produce NAND chips with extremely
low endurance ratios, like TLC or QLC.
But the main problem is, unlike SSDs, USB Flash Drives use controllers
without any kind of wear-leveling/wear-controlling and over-provisioning
technologies, that ensure the data gets evenly written across all NAND
cell blocks and prolong lifespan of every NAND cell block in
controllable fashion.
USB Flash drives write data anywhere as they see fit, so some NAND cell
blocks get more wear than others and could potentially fail at any time,
rendering filesystem unusable and making files partially corrupted or lost.
 

-- 
With kindest regards, Alexander.

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Using USB Flash / Pendrives or [micro]SD cards for backup rhkramer@gmail.com - 2019-03-18 14:40 +0100
  Re: Using USB Flash / Pendrives or [micro]SD cards for backup Charlie Kravetz <charlie@keepingdreams.com> - 2019-03-18 15:20 +0100
  Re: Using USB Flash / Pendrives or [micro]SD cards for backup Michael Stone <mstone@debian.org> - 2019-03-18 15:30 +0100
  Re: Using USB Flash / Pendrives or [micro]SD cards for backup "Alexander V. Makartsev" <avbetev@gmail.com> - 2019-03-18 15:40 +0100
    Re: Using USB Flash / Pendrives or [micro]SD cards for backup "Thomas Schmitt" <scdbackup@gmx.net> - 2019-03-18 16:20 +0100
      Re: Using USB Flash / Pendrives or [micro]SD cards for backup Pascal Hambourg <pascal@plouf.fr.eu.org> - 2019-03-18 17:20 +0100
  Re: Using USB Flash / Pendrives or [micro]SD cards for backup Matthew Crews <mailinglists@mattcrews.com> - 2019-03-18 17:30 +0100
    Re: Using USB Flash / Pendrives or [micro]SD cards for backup Gene Heskett <gheskett@shentel.net> - 2019-03-18 18:20 +0100
  Re: Using USB Flash / Pendrives or [micro]SD cards for backup Ben Caradoc-Davies <ben@transient.nz> - 2019-03-18 18:20 +0100

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