To provide service of mass storage, it has become a bottleneck in the way of using single old file server.

单一的传统文件服务器的存储方式已经成为网络存储服务的瓶颈。

youdao

And just like we likey, the Hydra supports USB mass storage allowing you to easily drag and drop music to the player, or any file for that matter for some good, USB flash drive portability.

ENGADGET: Ultra's Hydra: Ohio's full-featured 2GB MP3 player for just $60