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Thank you and this is very helpful. I have Samsung but it is slower than what Samsung should be getting. so perhaps I got a defective Samsung?

How do I make sure the one I get is from Samsung or SanDisk? that seems impossible but perhaps they ship the January batch with SanDisk and the February batch with Samsung, etc?

There's no way to tell. It's by luck. My MacBook Air had a SD0256F and got about the same speeds as yours.

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Ive read several places the larger the SSD drive is the faster the read/write speeds are

Only the 1TB SSD is faster than the 256/512 ones. The 1TB SSD has a 4-lane PCIe channel, while the 512GB and smaller have 2-lane PCIe channels.
 
There's no way to tell. It's by luck. My MacBook Air had a SD0256F and got about the same speeds as yours.

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Only the 1TB SSD is faster than the 256/512 ones. The 1TB SSD has a 4-lane PCIe channel, while the 512GB and smaller have 2-lane PCIe channels.

Thanks. Let me make one correction so I don't mislead others. I checked again and turned out my 256GB for MacBook Pro Retina 13 is SD0256F (SanDisk), not Samsung. So that explained why the difference.

Now the question is, do I want a SanDisk or a Samsung? I will visit Apple store to find out what my options are. Chances are there isn't a way to specify what brand of SSD/controller when I place my order. It may be based on luck.
 
Thanks. Let me make one correction so I don't mislead others. I checked again and turned out my 256GB for MacBook Pro Retina 13 is SD0256F (SanDisk), not Samsung. So that explained why the difference.

Now the question is, do I want a SanDisk or a Samsung? I will visit Apple store to find out what my options are. Chances are there isn't a way to specify what brand of SSD/controller when I place my order. It may be based on luck.

Yes it's luck all right. My 13" MacBook Air had a SanDisk SD0256F, while my iMac 21.5" had a Samsung SM0256F.
 
2.6/8gb/512gb

Samsung 512gb
 

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