Fbo Delivers Sustained Mobile Phone Performance -

Even if data appears contiguous to the software, the physical flash memory (NAND) may store it in non-contiguous locations due to background tasks like garbage collection .

By physically reordering data into contiguous blocks, FBO can restore read speeds to "like-new" levels—for example, returning a degraded device to a 1900MB/s read speed. Market Implementation & Standards Implement File-Based optimization functionality - LWN.net FBO Delivers Sustained Mobile Phone Performance

The host asks the storage device for the current physical fragmentation level of those files. Even if data appears contiguous to the software,

As a mobile device is used, files are constantly written, deleted, and modified. Over time, this leads to two types of fragmentation: files are constantly written