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

Parts of a file are scattered across different logical addresses.

This fragmentation forces the storage controller to perform multiple "seeks" to read a single file, significantly slowing down app launches and system responsiveness.

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

The host (phone's OS) identifies specific files or address ranges that are critical for performance.

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

This report examines , a storage technology standardized by JEDEC to ensure mobile phones maintain high speeds throughout their lifespan . While new smartphones often feel fast, performance typically degrades over time as data becomes fragmented; FBO is designed to solve this specific "lagging" problem. The Core Problem: File Fragmentation