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, ju...@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
