UFS – Universal Flash Storage is a drive specification for smart phones, digital cameras and similar devices. It’s the size of a (very) large fingernail and replaces earlier eMMC and SD card specifications. For example, a Micron UFS 4.0 card is 11 x 12mm in size with an extended one coming 9 x 13mm in size. UFS is SCSI-based, supports SCSI tagged command queuing and the standard is looked after by JEDEC. The JEDEC UFS standard refers to both embedded memory storage and removable memory cards.

Kioxia UFS memory card.

Here is a table showing how the standard has developed;

Micron is building an extended UFS 4.0 card with more speed and SK hynix is developing a UFS 5.0 card.