Maximum PC: It's been a long, long time since Plextor's bread and butter was high-quality optical drives. It's perhaps a little bit ironic that Plextor's newest product is intended for Ultrabooks, a form factor that largely shuns optical drives (only a handful of Ultrabook models ship with a CD/DVD or Blu-ray drive). Plextor finds itself focused on solid state drives (SSDs) these days, and the company's new M5M mSATA Series drives are intended to give Ultrabook owners some upgrade options. (CES 2013, PC hardware, Plextor M5M mSATA SSD)