The SD Association has just unveiled version 9.0 of the specifications for SD and microSD memory cards. This new release introduces new security-related features with support for Quick Start technologies (Fast Boot) and secure (Secure Boot), as well as the definition of a secure and hidden storage area, called RPMB (Replay Protected Memory Block). This area is only accessible after a successful authentication process.
Version 9.0 also includes TCG Storage, a secure storage method with encryption defined by the Trusted Computing Group. This organization manages, for example, the standard of the TPM platform required by Windows 11.
All of these elements will make it possible to securely boot an operating system or an installation process from the memory card.
Thus, it will be possible to launch Windows 11, or install it, from an SD or microSD card without compromising the integrity of the computer thanks to the Secure Boot function.
Memory cards could also become the sole storage medium for Chromebooks by hosting not only data, but also the operating system.
In addition, they can be used to host the firmware in devices such as drones, tablets and surveillance cameras. This will make it easier to replace the storage in the event of a hardware or software problem than in the case of a chip soldered on the motherboard.
An alternative to SSDs
But these new security features will also take SD memory cards to a new level. Associated with the standard SD Express, they will replace SSDs with SD or microSD cards. Indeed, the new Gen4x2 version of the SD Express standard makes it possible to offer speeds of up to around 4 GB/s, i.e. the speed of a good current NVMe SSD.
In addition, the security functions can be offered for any capacity, in particular on future SDUC (SD Ultra Capacity) cards capable of storing 2 to 128 TB of data. Again, it will be easier to replace a machine’s storage device if something goes wrong.
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However, these new features are optional in the SD Association 9.0 specification. Manufacturers of SD and microSD cards can therefore choose to implement them or not. It will thus be necessary to be vigilant during a possible purchase.
Source : SD Association