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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