Re: usb flash drives / sd
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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