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I had been looking to upgrade the Lilliputian drive space on my Late 2010 MacBook Air — it has the 128GB SSD and is very fast and effective, but has always made storage an issue. From the jump, I got a 64GB SD card for the machine as overflow for pictures and the others things that quickly gum up a computer’s memory. I tied it to a wireless 2TB drive…but that doesn’t come with me outside of the house, and the 64GB…well half that gets eaten up in pictures, the other in music.

I was on the cusp of a $170 SSD upgrade to a 256GB stick, then realized, I could just as easily drop a similar-sized SDXC card in the side of the machine for half the price. I settled on the PNY SDXC card with 256GB — effectively trebling my “hard drive” space.

Installation was simple: put it in the side of the Air, bring up Disk Utility and “erase” the card, setting it up for OS X Extended (Journaled). This took about two minutes. The PNY runs at at advertised 90MB/s, and that seems about right.

It took about a third the time to load the 50GB or so of material from the old SD card, plus my 35GB of music from the iTunes drive. So far, reading and writing is about as fast as hitting the laptop’s SSD. The only time there’s a lag is when you first hit the SD card after a bit of a wait or sleeping the computer. Once you start using it, no noticeable issues.

Total cost $80 to treble the “hard drive” space, and it allows you to pull the card and any important or sensitive information if you are traveling with the laptop. Bonus when going through airport security. There’s also the plus that you can use it on any other laptop (if you leave it in FAT format.) As for longevity: the first SD card is still going strong after 6 years — fist in an old Dell machine, then 4 years in the MacBook…so at least as long as the average laptop’s service time. The only real issue is that the card sticks out of the side of the laptop, and could be at risk for preakage, but it hasn’t happened in the time I’ve had it, and I’m not the kindest person to his laptop when traveling.

If you’ve got a MacBook Air 13″ with the 128GB SSD, this is a no-brainer for upgrading the machine on the cheap.