HyperOs HyperDrive

HyperDrive (HD) is a series of RAM-based solid-state drives invented by Accelerated Logic B.V. (became Accelerated Logic ltd., now apparently defunct - website for sale) employee Pascal Bancsi (for HyperDrive II architecture), who partnered with the British company HyperOs Systems, who manufactured the retail product. The HyperDrive interfaces with and is recognized by computer systems as a standard hard drive.

HyperDrive I

Originally called 'Accelerator', development began in 1999. It is an IDE device supporting PIO mode 1 transfer, and includes 128 MB SRAM.

HyperDrive II

After the SRAM Accelerator, it was switched to SDRAM, and uses 5.25-inch form factor, which allows the company to build Accelerator with capacity of 128 MB to 4 GB. It had maximum random access time of 0.15 ms. SDRAM was chosen over flash because of its speed advantage and reliability over flash memory.

Later generation uses 3.5-inch form factor and supports UDMA 33 transfer speed, with maximum capacity of 14 GB.