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M.2 2260 Flash Drive
APM2T60H200xxxxAN-xTMx
8
© 2015 Apacer Technology Inc. Rev. 1.0
4. Flash Management
4.1 Error Correction/Detection
H200-M implements a hardware ECC scheme, based on the BCH algorithm. It can detect and correct up
to 72 bits error in 1K bytes.
4.2 Bad Block Management
Bad blocks are blocks that include one or more invalid bits, and their reliability is not guaranteed. Blocks
that are identified and marked as bad by the manufacturer are referred to as “Initial Bad Blocks”. Bad
blocks that are developed during the lifespan of the flash are named “Later Bad Blocks”. Apacer
implements an efficient bad block management algorithm to detect the factory-produced bad blocks and
manages any bad blocks that appear with use. This practice further prevents data being stored into bad
blocks and improves the data reliability.
4.3 Wear Leveling
NAND flash devices can only undergo a limited number of program/erase cycles, and in most cases, the
flash media are not used evenly. If some areas get updated more frequently than others, the lifetime of
the device would be reduced significantly. Thus, Wear Leveling is applied to extend the lifespan of NAND
flash by evenly distributing write and erase cycles across the media.
Apacer provides advanced Wear Leveling algorithm, which can efficiently spread out the flash usage
through the whole flash media area. Moreover, by implementing both dynamic and static Wear Leveling
algorithms, the life expectancy of the NAND flash is greatly improved.
4.4 Power Failure Management
Power Failure Management is a mechanism to prevent data loss during unexpected power failure. DRAM
is a volatile memory and frequently used as temporary cache or buffer between the controller and the
NAND flash to improve the SSD performance. However, one major concern of the DRAM is that it is not
able to keep data during power failure. Accordingly, H200-M applies the flush mechanism, which requests
the controller to transfer data to the cache. For H200-M, DDR performs as a cache. Only when the data is
fully committed to the NAND flash will the controller send acknowledgement (ACK) to the host. Such
implementation can prevent false-positive performance and the risk of power cycling issues.
Additionally, it is critical for a controller to shorten the time the in-flight data stays in the cache. Thus,
H200-M applies an algorithm to reduce the amount of data resides in the cache to provide a better
performance. This algorithm allows incoming data to only have a “pit stop” in the cache and then move to
the NAND flash at once. If the flash is jammed due to particular file sizes (such as random 4KB data), the
cache will be treated as an “organizer”, consolidating incoming data into groups before written into the
flash to improve write amplification.
In sum, Power Failure Management proves to provide the reliability required by consumer, industrial, and
enterprise-level applications.