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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 ...


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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 ...


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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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