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Can you upgrade SSD on a Chromebook?
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Upgrading the SSD in Chromebook & MyDigitalSSD Super Boot Drive M.2 2242 SSD Review
Yes, you can upgrade the memory, HDD on Acer's $199 Chromebook - Liliputing
How to Use an External Drive With a Chromebook
SUHSAI Data Backup External Hard Drive USB 2.0 Portable Hard Disk 320GB Storage Memory Expansion Drive Slim & Lightweight 2.5 HDD For Laptop PC Desktop Computer Mac Chromebook (Black) : Amazon.co.uk: Computers
Acer Chromebook C810-T9CA Laptop Hard Drive Replacement - LaptopHDS.com