Innodisk, a Taiwanese manufacturer of specialized DRAM and NAND-based products, has received a patent for solid-state drives with a write-protection circuit.
Such SSDs could be used for a variety of embedded applications that require security, reliability, and durability.
Most hard drives and SSDs today are used to power applications that read, record, and overwrite data. Even cold storage applications may need to update data from time to time. But there are also embedded applications that never overwrite, and for many of them, overwriting is counterproductive or even illegal.
The market for such devices is quite large, ranging from arcade and casino machines to industrial and mission-critical applications. Therefore, it makes a lot of sense for a company like Innodisk to patent an SSD with a write protection circuit.
In contrast to software write protection solutions, the Innodisk method uses hardware circuits that can be activated via a hardware switch or a command issued by the host. So far, Innodisk has implemented the write protection function using a jumper and a software trigger. Given that Innodisk makes many bespoke products, the company can implement its Write Protect technology in any way a particular customer wants.
Innodisk filed an application for patent 1