Micron MTFDGAR1T4MAX-1AG13ABYY Fiche technique télécharger pdf (Page 6)

Functional Description

Data Retention

Data retention refers to the SSD's media (NAND Flash) capability to retain programmed

data when the SSD is powered off. The two primary factors that influence data retention

are degree of use (the number of PROGRAM/ERASE cycles on the media) and tempera-

ture.

The SSD provides power-off data retention of two months at 40°C (MAX) when total

bytes written (TBW) is reached.

Micron RAIN Technology

Redundant array of independent NAND (RAIN) is a technology developed by Micron

designed to extend the lifespan of the device.

Residing in the ASIC controller, RAIN is similar to redundant array of independent disks

(RAID) technology, but instead of grouping and striping disks, RAIN groups and stripes

storage elements on the SSD across multiple channels, generating and storing parity

data along with user data (one page of parity for every seven pages of user data). This

data structure (user data plus parity) enables complete, transparent data recovery if a

single storage element (NAND, page, block, or die) fails. If a failure occurs, the SSD au-

tomatically detects it and transparently rebuilds the data. During this RAIN rebuild

process, the SSD's performance is reduced temporarily but will recover after the rebuild

process completes.

Wear Leveling

Wear leveling is a technique that spreads Flash block use over the entire memory array

to equalize the PROGRAM/ERASE cycles on all blocks in the array. This helps to en-

hance the lifespan of the SSD. The device supports both static and dynamic wear level-

ing.

Static wear leveling considers all Flash blocks in the SSD regardless of data content or

access and maintains an even level of wear across the drive. Dynamic wear leveling

monitors available free space on the device and dynamically moves data between Flash

blocks to equalize wear on each block. Both techniques are used together within the

controller to optimally balance the wear profile of the Flash array, along with the life-

span of the device.

P420m HHHL PCIe NAND SSD

Functional Description

PDF: 09005aef853f2344

p420m_hhhl.pdf - Rev. O 8/2014 EN

Micron Technology, Inc. reserves the right to change products or specifications without notice.

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