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A: Yes, this can be used in a PC, although it will need a laptop to desktop mounting bracket / adapter to fit properly.
Q: Is there cloning software included at no charge with this drive?
A: I didn't receive any cloning software with this item, but Macrium Reflect is a good free backup, cloning software that i have used.
A: This question has probably been answered for the satisfaction of the op, however for future questioners it may be beneficial to answer the actual difference between the drives.. The {G25} is the type of drive, and therefore both will be the same performance, mtbf, etc. The main difference is that the 500gb drive is a 4k sector structure, and the 512gb drive is an 512b sector structure.. 512b storage devices of any kind will have a storage capacity divisible by 8 and typically increase by a factor of 2xbase, so 8gb, 16gb, 32gb, 64gb, 128gb, 256gb, 512gb, 1024gb, etc. In general there will be no significant difference between the sector structure, perhaps a sight difference between lost mb's when formatted.. The 512b storage devices will generally lose a little less mb when formatted due to being easier to round off partition sizes given the smaller sector size. However there is a legacy difference in operating systems such as Unix, and variants like Linux, where those operating systems were designed to expect 512b sectors and all but the newer kernal versions of Unix variants may have trouble installing and/or managing 4k sector drives.. If you do not plan on using Unix and variants, or do not plan to replace a drive in an older Apple computer, you will likely have nothing to worry about and can purchase whichever gives you the most mb/$.
A: Either one would be a good choice. The Samsung is slightly faster according the the specs, but in reality, you'll never see a performance difference.
Q: Can this used for a dell laptop?
A: As long as your Dell has a 2.5in SATA HDD you can replace it. Also check the thickness of your old HDD.
A: It will fit your Dell. It comes with a free software that will allow you to clone your existing SDD to the new larger ssd. You will need an external usb - sata connector in order to connect the new SDD to your system to clone. They are around $25 at Best Buy.
A: You certainly could use an external USB-Sata hub to do the cloning. But in answer to your question about cloning using the bays in your computer, I am going to assume you want to clone the boot drive, so this should work with the 2 bays and most cloning software. If for some reason you are cloning the non-bootable disk, then you will only be able to use cloning software that can boot from an external device like DVD or USB drive.