Power Shield (PS) and Power Loss Protection (PLP)

Most of the enterprise SSD support PLP and PS features. SSD will cache the data in DRAM to allow faster writes. Then it will write to the flash. PS technology will make sure controller will stop writing to the NND flash or DRAM when there is a power loss(voltage drop) with the help of internal voltage detection circuit. This way NAND will be intact only the data in DRAM will be lost. PLP will assist to flash the DRAM to NAND and there by make it write protect when certain voltage level it will reach. It increases the time to make sure most of the contents are written.

Source: Power Shield (PS) – Transcend Information, Inc.

Source: What is Power Loss Protection

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24 years of experience in various layers of software. Primarily experienced in system side software design and development on server management software. Interested in linux development in x86 and arm architecture.