SanDisk has started sampling the tiny chip that will make 512TB SSDs possible in 2027, but don't expect them to…

• SanDisk's BiCS10 chip reaches 29Gb per square millimetre in density
• Bit density improved 59% compared to the previous BiCS8 generation
• Interface speeds now hit 4.8Gb/s, a 33% increase

SanDisk has confirmed it is now sampling BiCS10, its 10th-generation 3D NAND flash chip, built jointly with longtime manufacturing partner Kioxia.

The 1Tb TLC chip packs 332 memory layers into a die that reaches an area bit density above 29Gb per square millimetre, which the company calls industry-leading.

That figure represents a 59% improvement in bit density compared to the previous BiCS8 generation currently in mass production.

A small chip built to scale into massive drives

BiCS10 uses Sandisk's CMOS directly bonded to an array architecture, paired with a new Toggle DDR6.0 interface that pushes data transfer speeds up to 4.8Gb/s.

This marks a 33% improvement over the prior generation's interface speed, according to SanDisk's own announcement of the sampling milestone.

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