Originally published at: http://www.howtogeek.com/187104/warning-anyone-can-recover-deleted-files-from-your-usb-drives-and-external-ssds/
It’s common wisdom that deleted files can’t be recovered from solid-state media, only from traditional mechanical hard drives. But this only applies to internal drives — USB flash drives and external solid-state drives are vulnerable to file-recovery attacks.
Can files still be recovered from usb drives if they are erased with a program like Eraser??
Bear in mind that Flash drives of all types can use wear leveling; that means that when you write back to the same logical sector, the drive controller actually writes to a different physical sector. So Eraser can work, but you must use the "free space wipe" command, not the command that simply overwrites the file in place (because it won't actually overwrite the file. It will overwrite a different set of blocks.)
Personally, if I feel the need to clear an external drive, I use the "Drive Wiper" in the tools section of CCleaner. Fast and efficient (and free, of course). It gives the option to wipe only the "free" space (1, 3, 7, or 35 times), thereby eliminating any recovery of deleted files, or the entire memory.
Great article, I had honestly forgotten that TRIM isn't applied to external SSDs.
Looks cool but does it work with thumbdrives and SD cards?
I know it works with SSDs which have a Letter and can be addressed in its' drop down menu.
USB stick flash memory is not the same architecture as SSD memory so don't think so.
Really cool stuff and very useful resource about recovering hard disks
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