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Re: usb flash drives / sd

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On Fri, Aug 11, 2017 at 06:58:47PM -0500, Doug wrote:
> 
> On 08/11/2017 05:11 PM, Dan Ritter wrote:
> > On Fri, Aug 11, 2017 at 02:25:01PM -0500, Doug wrote:
> > > On 08/11/2017 01:46 PM, jumpy@tutanota.com wrote:
> > > > There are three major types of flash chip types : SLC - MLC - TLC
> > > > 
> > > > how-to check my usbkey/sd/memory card ?
> > > > 
> > > > -- 
> > > > Securely sent with Tutanota.
> > > I am not being a wiseguy.
> > > What is the difference, and why does it matter?
> > The basic difference is the number of bits recorded in a single
> > cell, and that affects both the storage density and its
> > long term reliability.
> > 
> > More bits == more dense but less reliable.
> > 
> > To compensate for long term reliability, SSD manufacturers use
> > a variety of strategies involving staging data in RAM,
> > compressing it, and implementing other special storage
> > structures.
> > 
> > On a removable-media flash device, none of those strategies
> > are used.
> > 
> > -dsr-
> > 
> Perhaps I misunderstood. I thought you were referring to usb flash drives.
> Do you mean these little chip gizmos that go into digital cameras?
> 
> (Hope I am not being a nuisance.)

What's the difference between:

- a USB "thumb drive"
- a USB SSD
- an SD, SDHC, SDXC "memory card"
- a SATA SSD
- an M.2 SSD

They are all persistent data storage (i.e. doesn't disappear
when the power goes off) using a technology that stores
electrons (or lack of electrons) in 'cells'. They differ in:

- interface to your computer
- strategies for reliability
- speed and capacity
- quality control
- price

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usb flash drives / sd <jumpy@tutanota.com> - 2017-08-11 21:10 +0200
  Re: usb flash drives / sd Sven Hartge <sven@svenhartge.de> - 2017-08-11 21:20 +0200
  Re: usb flash drives / sd Doug <dmcgarrett@optonline.net> - 2017-08-11 21:30 +0200
    Re: usb flash drives / sd Dan Ritter <dsr@randomstring.org> - 2017-08-12 00:20 +0200
      Re: usb flash drives / sd Doug <dmcgarrett@optonline.net> - 2017-08-12 02:00 +0200
        Re: usb flash drives / sd <tomas@tuxteam.de> - 2017-08-12 09:20 +0200
        Re: usb flash drives / sd Dan Ritter <dsr@randomstring.org> - 2017-08-13 15:00 +0200
          Re: usb flash drives / sd Fungi4All <fungilife@protonmail.com> - 2017-08-13 16:00 +0200
            Re: usb flash drives / sd Dan Ritter <dsr@randomstring.org> - 2017-08-13 17:40 +0200
  Re: usb flash drives / sd Dan Ritter <dsr@randomstring.org> - 2017-08-12 00:10 +0200

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