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I’m a chemical engineering student. I want to buy MacBook air for online class. I have iPad pro 11 with magic keyboard but I use it to write notes and PDF. Is 256gb enough for me? (I uses 112gb for both my data and system in my old Windows laptop)

An iPad Pro 11 is plenty enuf for “write notes and (creating) PDFs.” So you already got what you need. Get an external hard drive to backup everything.

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Write on PDF: All You Need to Know

You don't want the whole laptop going to pieces. So get another external hard drive. And if you know anything about how Apple has handled hardware for its MacBook this year, you might want to get that one instead too, to make it more portable. So that's your hardware set, don't worry about it too much. Next we get to the Macro and Thunderbolt. 1. Macro 2016+ Power Supply Review. We've discussed a few times how Macro just ain't cut out for serious server use. That's because Macro has 2 PCIe x16 slots for SSDs and one PCIe x4 slot for storage, all of which can only support Thunderbolt. However on the other hand, it can handle the Intel Leon Haswell-based LAPTOP (if you buy it) for a single 12 GB SSD and 1 TB HDD and can handle a 16 GB SSD and 2 TB HDD without problems. So that's a plus right.