There are several problems such as potential security issues, poor transmission performance, low reliability, and heavily dependent on service providers in existing enterprise net-disk based on public cloud. To address these problems, this paper aimes designs a secure enterprise net-disk system, named SkyDisk, based on the multi-cloud servers. SkyDisk provides a full control of files, high-speed data accesses, confidentiality, and reliability for storing the files. Before stored, all files have been encrypted with 256 bit advanced encryption standard, and encoded with Reed-Solomon codes. Each cloud server saves a piece of cipher text of original files, and the files can be recovered even if some servers fail. In addition, parallel transfer of data between local net disk servers and multiple cloud servers can achieve high-speed of upload and download. Finally, SkyDisk implements a Web service, maintains file metadata and user information, and provides users with web access. The test results show that the system can achieve secure and reliable file storage management. At the same time, it can satisfy the functional requirements such as quick upload, download and, convenient file sharing, to reduce the cost of file management and improve production efficiency.