The good news is that SSDs often ship with on disk encryption. You could do this 7 times and still have the same data recoverable. You could fill the whole disk with a new file (say one containing only zero's) and the reserve space would not be touched. This means that there is no direct mapping between what the OS sees are sectors (pages) and what is on disk. It will then mark the old page as empty and assign the old page number to the new page. If you want to add a sentence then the SSD's controller will read the whole page and write a new page (with the extra sentence) to a different location. Think of it as a book where you can only write to a page. They have a number of blocks which are grouped. Overwrite the disk several times with varying patterns, defeating even the most capable attackers.Think of it as erasing pencil written notes and writing new text. If you have access to a very sensitive hardware, the kind only governments have access to, then you may be able to recover some of the data. To clean data from a conventional harddisk you had the following solutions: If needed you can implement it and tell the client that you did, but do not expect it to wipe all data.
A multiple (7) pass overwrite erase does not do what you expect it to do on a SSD.
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