scope:

Universal Flash Storage (UFS) is a flash storage specification for digital electronic devices. The purpose of the Zoned Storage for UFS standard is to enable higher bandwidth, lower latency and to reduce write amplification. These objectives are realized as follows:

● Zoned storage enables reducing the size of the L2P table for zoned logical units. If the L2P table does not fit in UFS device SRAM without using the zoned storage interface then the switch to zoned storage may make it possible to eliminate L2P paging and hence increases bandwidth and reduces latency.

● It is recommended that vendors make the zone size close to the size of the erase block size. "Close" means that the zone size is identical to the erase block size, a small integer multiple of the erase block size or that there are two or more zones per erase block. Device-side garbage collection and write amplification due to garbage collection are eliminated if the zone size is equal to or a multiple of the erase block size since garbage collection is moved from the UFS device to the host. If there are two or more zones per erase block then the UFS device still has to perform garbage collection.

● Host software can optimize read performance by allocating a contiguous LBA range per file.