Write-once SD cards by Sandisk

Sandisk has released a remarkable series of SD cards earlier this week. The WORM (Write Once Read Many) memory can only be written a single time. Like with a CD-R, placed files can no longer be altered or deleted. 

According to Sandisk, the memory will be useful for data that requires a great integrity, such as evidence in a lawsuit. The company claims that its physically impossible to modify or delete data from an individual file. Under the right circumstances, a WORM card should stay readable for up to a hundred years. 

Currently, there's only a 128 MB model announced, but Sandisk assures larger versions will follow. Prices and availability are unknown. 

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