IM242S
User Manual
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performance close to the Shannon limit when decoded with the belief-propagation (BP) algorithm
using soft-decision information.
3.4 Wear-Leveling
Flash memory can be erased within a limited number of times. This number is called the
erase
cycle limit
or
write endurance
limit
and is defined by the flash array vendor. The erase cycle
limit applies to each individual erase block in the flash device.
ICOP IM242S uses a static wear-leveling algorithm to ensure that consecutive writes of a specific
sector are not written physically to the same page/block in the flash. This spreads flash media
usage evenly across all pages, thereby extending flash lifetime.
3.5 Bad Blocks Management
Bad Blocks are blocks that contain one or more invalid bits whose reliability are not guaranteed.
The Bad Blocks may be presented while the SSD is shipped, or may develop during the life time
of the SSD. When the Bad Blocks is detected, it will be flagged, and not be used anymore. The
SSD implement Bad Blocks management, Bad Blocks replacement, Error Correct Code to avoid
data error occurred. The functions will be enabled automatically to transfer data from Bad Blocks
to spare blocks, and correct error bit.
3.6 Power Cycling
ICOP’s power cycling management is a comprehensive data protection mechanism that functions
before and after a sudden power outage to SSD. Low-power detection terminates data writing
before an abnormal power-off, while table-remapping after power-on deletes corrupt data and
maintains data integrity. ICOP’s power cycling provides effective power cycling management,
preventing data stored in flash from degrading with use.
3.7 Garbage Collection
Garbage collection is used to maintain data consistency and perform continual data cleansing on
SSDs. It runs as a background process, freeing up valuable controller resources while sorting
good data into available blocks, and deleting bad blocks. It also significantly reduces write
operations to the drive, thereby increasing the SSD’s speed and lifespan.
