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Secure Erasing SSD

Hi guys, I will be selling my two SSDs (120GB) and I will be securely erasing the two drives, I am very much familiar regarding securely erasing mechanical drives and smartphones and I did read about secure erasing SSDs before.

My first stop was is using my SSD manufacturer's software/tool but those application's secure erase feature is not working or unavailable (one experience I had with SanDisk was it locked my drive causing me to have it replaced), so I do not have this option anymore.

I am not sure about the TRIM method and how it work and I am not going to use any secure erase methods used for mechanical drives.

So I am wondering if it would be effective to secure erase the an SSD by filling it with huge files (i.e. huge files such as VM disk or huge movie files), I will copy one huge file on the drive then make copies of itself several times until full then format the drive afterwards. Do you think this will be an effective means of secure erasing the drive?
 
What specific SSDs are these? You mentioned Sandisk, what is the other one?

I would use a linux boot CD/DVD/ USB drive and secure erase them.
Writing data to the drive is no guarantee of anything.
 
What specific SSDs are these? You mentioned Sandisk, what is the other one?

I would use a linux boot CD/DVD/ USB drive and secure erase them.
Writing data to the drive is no guarantee of anything.

Thanks Elixer, the other SSD is Kingston SSD Now V300, the SanDisk one is SSDPlus. Both manufacturer's tool doesn't work. I have tried and filled the Kingston with large files once and formatted it then I used Recuva to check if it can see the deleted files and it can only recover the files I have filled it in, seems like it worked. I will try to fully fill the drive one more time.
 
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