Fbo | Delivers Sustained Mobile Phone Performance

If fragmentation is high, the host instructs the device to perform physical defragmentation .

FBO is a feature introduced in the (Universal Flash Storage) standard to combat this aging effect. It functions through a specific host-device protocol: 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 . If fragmentation is high, the host instructs the