> making it impossible to reliably delete material
That said, SSD's have improved the situation a lot with TRIM. While previously deleting a file wouldn't actually destroy any data until it was overwritten. With TRIM in most cases for files more than a few KB almost all the data will be physically destroyed soon after TRIM is called. It depends on settings. But that's commonly either immediately, or about once a day (the default on Android).
If you read the forensics literature TRIM has caused them enormous problems by radically reducing the amount of data available.
That said, SSD's have improved the situation a lot with TRIM. While previously deleting a file wouldn't actually destroy any data until it was overwritten. With TRIM in most cases for files more than a few KB almost all the data will be physically destroyed soon after TRIM is called. It depends on settings. But that's commonly either immediately, or about once a day (the default on Android).
If you read the forensics literature TRIM has caused them enormous problems by radically reducing the amount of data available.