What is the purpose of TRIM in SSD maintenance?

• A. It informs the SSD which blocks are no longer in use so they can be reclaimed, improving wear leveling and performance.
• B. It allows the OS to reallocate data blocks automatically without intervention.
• C. It helps the SSD automatically fix read errors.
• D. It compresses data blocks on demand.

Answer: (A)

TRIM is about telling the SSD which blocks are no longer in use so they can be reclaimed during garbage collection, which keeps performance up and wear spread evenly. In SSDs, data is written to blocks that must be erased before reuse. When the OS deletes a file, it usually just marks those blocks as free, but the SSD doesn’t know they’re actually unused unless TRIM communicates that. Without TRIM, the garbage collector can’t safely reclaim space, leading to more write amplification, slower writes, and uneven wear. By issuing TRIM, the system informs the SSD that specific blocks are obsolete, allowing the SSD to erase them in the background, reclaim space, and prepare clean blocks for future writes. This helps sustain performance and endurance over time. It doesn’t auto-reallocate data blocks, fix read errors, or compress data on demand.