Abstract: The present invention relates to a portable digital device and service system having an Internet over Small Computer Systems Interface (iSCSI)-based remote storage service function in a wireless environment. The object of the present invention is to overcome the problem in which a conventional iSCSI network storage system in a wired iSCSI client environment can operate on a Windows or Linux platform but cannot operate in the environment of a portable digital device, such as a Personal Digital Assistant (PDA), that operates on a wireless network. In the present invention, an iSCSI initiator driver unit is installed on a portable digital device operating on a wireless network, so that data can be stored on the Small Computer Systems Interface (SCSI) disk of a remote target computer and stored data can be read from the SCSI disk. The present invention has the advantage of allowing iSCSI storage service to be used on a portable digital device in a wireless network environment.