What is Garbage collection?
In an SSD, moving the still-valid data out of blocks that contain invalid data and then erasing those blocks to create free space.
Field: SRAM and flash memory
Garbage collection in the explanations
These extra copies cause write amplification, and the fuller the drive, the more often garbage collection runs and the more write performance suffers.
Which correctly describes garbage collection in an SSD?Deleting a file only updates the OS's bookkeeping, so the SSD does not know the data is obsolete and keeps copying it during garbage collection.
Which command notifies an SSD of space freed by files delet…Even partial updates cannot overwrite in place: new data goes to a free page, the old page is marked invalid, and garbage collection later erases blocks in bulk.
What is the unit in which data is erased in NAND flash memo…
Questions that mention Garbage collection (6)
- Which correctly describes garbage collection in an SSD?
- Which command notifies an SSD of space freed by files deleted by the OS, making garbage collection more efficient?
- What is the unit in which data is erased in NAND flash memory?
- Which correctly describes "overprovisioning" in an SSD?
- Which correctly describes "write amplification" in an SSD?
- What is the basic unit for reading and writing (programming) in NAND flash memory?
Related terms
Write amplification TRIM NAND flash memory NVMe Word line TLC (triple-level cell) 3D NAND 6T SRAM cell Charge-trap cell Floating gate