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Dell’s 8GB and 16GB vFlash SD Card
As of Dec 2011, Dell released high endurance 8GB (Giga Byte) and 16GB vFlash SD cards based on MLC NAND flash. These cards are 100% factory overprovisioned for highest endurance.
The 8 GB vFlash SD card is built with two 64 Gbit NAND flash chips totaling physical NAND capacity of 16 GB. It has 8GB more physical NAND flash than the logical capacity presented through the operating system (OS) as available for the user. The extra 8 GB NAND blocks are reserved for bad block replacement in the case of NAND block failure.