Which of the following HSSD reliability technologies can prevent disk data loss when the storage system loses power unexpectedly?

Question

Options

• ARAID
• BWear leveling
• CPower failure protection
• DBad block management

• A
  12% (4)
• B
  3% (1)
• C
  79% (27)
• D
  6% (2)

Explanation

Power failure protection (C) is the correct answer because it is specifically designed to ensure that data being written to an SSD is safely committed to non-volatile storage in the event of a sudden power loss - typically using capacitors or other energy reserves to complete in-flight write operations before the system shuts down.

Why the distractors are wrong:

• RAID (A) protects against data loss from drive failure (e.g., a failed disk), not sudden power loss during a write operation.
• Wear leveling (B) extends the lifespan of NAND flash by distributing writes evenly across cells - it has nothing to do with power events.
• Bad block management (D) handles defective memory cells by redirecting data to healthy ones, which is a durability feature unrelated to power interruptions.

Memory tip: Think of "Power failure protection" as the SSD's emergency brake - when the power cuts out, it gives the drive just enough juice to stop safely without losing what's in motion.

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