Transcend Jetdrive Lite

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If you've got a MacBook with an unused SD slot, you're absolutely going to want one of these new Jetdrive Lites from Transcend. These little expansion cards add 64-128GBs of storage and are built using high-end MLC NAND flash chips for read/write speeds up to 95MB/s and 60MB/s, are built to last and are completely resistant to dust and water.

$49-$99, Transcend