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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). People have a concern about this option having gone missing, even if they used it as an extra measure of security, rather than ever having had a breach due to not using it. I’ve seen this question come up a number of times since late in the El Capitan public beta cycle, and you can find hundreds of postings about it on Apple’s forums and elsewhere.

Secure Empty Trash: We lost that option with El Capitan how could we get it back?

Yves Laurin echoes a concern of many people: