Because each erasable area of memory suffers from wear-and-tear with each write (which includes erasure), SSD management software tracks usage unit by unit, rotating through available storage to distribute wear across an entire drive, dramatically improving its life expectancy.ĭepending on the SSD controller and other factors, it can be impossible to assure that the specific memory locations were erased, which providesĪ slight but reasonable chance of recovery parts of deleted files. However, Solid-State Drives (SSDs) don’t store data in the same fashion as HDDs. You’d need to fall afoul of a government agency or be the target of a high-end criminal enterprise. While it’s well-known and proven by academic and private researchers that overwriting a magnetically-stored 0 or 1 once doesn’t mean it can’t be read as an electromagnetic ghost later, someone casually interested in your files can’t recover them. Secure Empty Trash wouldn’t just delete the file’s index, but also would overwrite it a single time with zeroes. Secure Empty Trash (hold down the Command key while emptying the Trash) is no longer available in OS X El Capitan. The space is available for other files, but someone could still recover the data from magnetic spinning media, or at least read some of the deleted files using basic disk repair or disk analysis software.
When you perform a normal Empty Trash operation, the file isn’t immediately overwritten on your HDD rather, the disk’s index, created as part of the formatting operation, has its entry for that file removed. Secure Empty Trash was originally designed around hard disk drives (HDDs).
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