The Solid State Drive (SSD) is nowadays commonly installed in mobile devices or Ultrabook owing to its compact size and fast processing speed. However, due to ever shrinking space on edge of lid, the WLAN antennas are now usually located at base of Ultrabook computer and thus suffers EMI noise power generated from high speed SSD. Therefore the broadband EMI noise resulted from SSD operation would usually invade the RF communication channel, and thus degrades the receiving sensitivity of the system. In addition, when WiFi tethering is used for cloud applications with the 3G/4G WWAN network through smart phone, the EMI noise from SSD would also affect the file down-loading of mobile phone. Because when Internet accesses with WWAN network, the users always place the mobile phones by side of notebook computer with built-in EMI aggressive SSD. Since the receiving sensitivity of wireless system is the key issue for cloud applications as required by CTIA and related organization, this study investigates the EMI noise coupling mechanism from SSD to antenna and also analyzes the effect on WLAN perfor- mance. The coupling mechanism of EMI noise between SSD and RF modules can be categorized as antenna coupling, circuitry coupling, and cavity coupling. With the help of near-field EMC analysis for closely located RF and digital modules in this study, we can identify the root cause of receiving sensitivity degradation and benefit the manufacturers for proper SSD integration with mobile device or Ultrabook computer from compact form design limitation. We also evaluated the noise limit and frequency range for platform noise of wireless communications, and hope to apply the noise budget concept and IC-EMI measurement techniques on the component level to help SSD-related manufacturers and wireless communications system manufacturers to improve the integrating design to meet the performance and EMC requirement in the future study.