.... i am thinking about buying a kingspec 64GB (128 is too expensive for me )...Why on earth KingSpec? I personally wouldn't touch that brand with a six foot pole.
You're located in Germany, right? Get the used 128 GB Samsung PM871b M.2 SSD on ebay.de for 10-15 EUR. Add IDE to M.2 'white box' adapter from AliExpress and that combo will serve you for the rest of your life.
https://www.aliexpress.com/item/1005006355478367.html
https://www.aliexpress.com/item/1005005761995669.html
And, btw, what's your budget if 128 GB is too expensive?
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..it seems YANSEN is now the new brand that was previously KingSpec, does anybody know please if they work just as good or if there is models to avoid?https://www.youtube.com/watch?v=v7YBCynA-b0
Two year old test of PM871b M2 below. IIRC, it was in Mini 1.42.