Sandisk Ultra 3D SSD 2Tb: I purchased this drive as replacement for the original 1Tb mechanical HDD in a seven year old Toshiba S55-A laptop now running Windows 10. The existing drive was cloned using Macrium Reflect software via USB 2.0 and a StarTech USB-IDE-SATA adapter with external power supply. The first attempt to clone failed with a write error at about 15% transferred, however, I believe that was an adapter problem since after disconnecting/reconnecting the several cables and restarting, the clone proceeded successfully. Cloning over USB 2.0 is, however, a very slow process requiring approximately 6-7 hours for 1Tb. A faster approach would have been to buy a disk caddy for the optical drive bay (about $30), however the slower USB transfer did keep the SSD temperature low. After cloning and swapping drives, The computer booted in seconds rather than minutes and now is a transformed machine, as I had expected. It has even allowed me to install and run Davinci Resolve, a video editing software suite with very demanding hardware requirements, albeit with some limitiations. (the relevant laptop specs are i7 processor; 16GB ram; Intel integrated graphics) Physically, the Sandisk SSD is very lightweight with an all plastic housing, which proved beneficial when I discovered that one drive mount in the laptop had apparently been broken in original assembly so that the drive was only anchored on one side. With the much lower mass of the Sandisk SSD, I believe that the remaining single mounting rail is adequate. In other reviews, I've seen comments that the Sandisk drives are not supplied with cloning software, and a cursory look at the Sandisk (WD) site seems to confirm this as only the Sandisk Dashboard software is listed under downloads. The Identical WD Blue SSD, however, does list the WD version of Acronis cloning software as a download and, once you install the Sandisk Dashboard and dig into the menu tree, you'll find "Other Software" which is a link to Acronis, so WD does provide cloning software, although it is not obvious. I prefer Macrium Reflect because it can clone the drive on which it is running, without having to boot to a rescue disc or USB drive, and it is also free. Only time will tell how the 500TB written that is specified for the SSD will translate to the life of the drive, but I expect that will not be the limiting factor for this laptop. In all, I am quite satisfied with my purchase and highly recommend the Sandisk SSD.