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Flash storage, particularly SSDs, require a block/cell be wiped before more data can be written. As a result, writing would be slow if additional technology wasn't implemented. Instead, your drive actually has 10-20% more storage than the listed capacity and an onboard memory controller will dynamically map empty cells and, during low load, wipe unmapped ...


Without knowing your particular use case I'll supply an alternative answer that you might find useful, and it's one I use myself. Encrypt the data stored on the device. Use a device such as the LOKIT (http://www.lok-it.net/) which has built in encryption. Create a TC (TrueCrypt) container and put all data in this. Once you're done, change the password to ...


You can use dd (disk destroyer) to write 0s on the whole disk : dd if=/dev/zero of=/dev/sdb bs=4096 Where /dev/sdb is the path of the mounted partition.

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