You can always move data elsewhere, or use your HDD as a secondary drive, but make sure the data isn't present when you try to clone the drive.

You just can't copy 300GB into 250GB of space. Because of the pricing at the moment, your SSD is most likely smaller than your HDD - so make sure that the space used on your HDD will fit within your SSD. Easiest way to clone is to copy a small HDD to a large SSD - that way, everything fits easily.

check how the sizing of things works out.

In most programs it's remarkably easy to swap the source and destination accidentally - causing you to overwrite all of your data with nothing.

make sure you are copying from the old to the new.

Only watched a few seconds of the vid because I'm on mobile, but I noticed that he was using an Acronis product - my personal preference is CloneZilla, but that's just me. HDDs need this because data is read via a sort of magnetic needle on a spinning disk, but SDD are solid state and thus don't benefit from defragmenting not only that, but defragmenting rewrites most all the data on the drive, which wears down the SDD's lifespan, and most modern OSs are set to automatically defrag any HDDs on a regular basis. If you are unaware, defragmenting is where the computer sort of reorganizes the data on a HDD so that all the related files are right next to each other on the physical hard disk rather than scattered across it, thus making the HDD faster to load that data. Generally the average SSD can last a decade of normal use, but this can be shortened a bit if the user/OS uses some poor practices, such as a lot of caching to the SSD, or more importantly defragmenting (which is probably the main change). I think the issue is SSDs can only have data rewritten so many times before bits stop working.

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How clone operating system to ssd