Originally Posted by Megadrone
whats the difference between pro and non pro?
If you are talking about the SanDisk Extreme Pro, there is a huge difference between it and the only other SATA 3.0 drives still in their current lineup. The Extreme Pro was the pinnacle of their MLC NAND-based drives, and I believe they are no longer being produced anymore because the price has risen sharply. They are on par with the Samsung 850 PRO in terms of sustained Read and Write speeds, with the Samsung winning on IOPs and 4K R/W. The SanDisk Extreme is a few generations ago older model and you will pay through the nose for older technology if you can find one NIB. The SanDisk SSD Plus and Ultra II are TLC-based, and therefore slower in sustained R/W. They are the only 2.5" format drives that SanDisk is currently offering. Personally I would stay away from all of them except the Extreme PRO, but good luck finding one for a decent price. If you are paying more than for an 850 EVO then you are paying too much.
Almost all PC products follow a very similar pattern on price/availability based on the Law of Supply and Demand. Initial release phase = high price, more demand than available. Production phase = market price (lower). Product end of life (EOL) phase = low price, best time to buy because retailers are dumping stock. Post EOL phase = high price since they become more rare in "new in box" condition. Sometimes you can get lucky and find one for sale on Amazon by a third party seller, so I always check those options when looking for something specific. I was able to pick up my forth 480GB SanDisk Extreme Pro for $200 last November to complete a set for a 4 drive RAID 10 array. At one point the 960GB could be had for less than $400. They are good, fast, reliable and carry a 10 year warranty. They are also very easy to manage in a RAID array due to SanDisk's SSD Dashboard. You can even update the firmware without breaking the array.
I wonder what SanDisk would give you if you had one die 9 years from now?