Essentially, data can’t be overwritten onto flash cells – to write new data, the contents of the flash memory must first be erased. When you use a TRIM-enabled SSD (all modern SSDs support TRIM), deleted files are removed immediately and can’t be recovered. Solid-State Drives Work Differently: None of this applies to solid state drives (SSDs). If you want to erase a file’s contents when it’s deleted, you can use a “file-shredding” tool – see the last section for more information. To increase performance and save time, Windows and other operating systems don’t erase a file’s contents when it’s deleted. To actually erase the file’s contents, it may take several minutes – just as long as if you were writing 10 gigabytes of data to your hard drive. For example, if you’re deleting a 10 GB file, that would be near-instantaneous. In contrast, actually erasing a file by overwriting its data takes significantly longer. Deleting a file’s pointer and marking its space as available is an extremely fast operation. If you’re wondering why your computer doesn’t just erase files when you delete them, it’s actually pretty simple. Image Credit: Matt Rudge on Flickr Why Deleted Files Aren’t Erased Immediately Note that this doesn’t apply to solid-state drives (SSDs) – see below for why.
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