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8mm and the 4mm ( a . k.a . DAT Tape ) . As most GIS systems now operate in a PC environment, a major challenge has emerged for the standardization of tape use . Standards do not apply across all systems and configurations . The table below lists some standard transfer media and their characteristics . Compact Media 1 x.044 Unix and PC 700 MB Excellent media for transferring large files. -yO 4 DVD- R Unix and PC 4. 7 GB-94 GB Comparable to the CD, but has larger storage capacity. Included on most new PCs. ZIP Drives PC 100 MB As standard as comes with a PC . Good for data transfer with other PCs Ditto or Jaz PC 100 MB - 2 GB Good for PCs but no standards exist . Data sharing between machines is difficult I Diskette Excellent for small files . Standard drives allow for Unix and PC 14 MB data sharing between all types of computers. Not good for big files. Many new computers no longer include diskette drives . 8mm Unix and PC 2GB - 20GB Is used extensively on Unix computers. Stores much data . Also, used on PCs but backup methods vary by drive. Backup speeds are fast. It is recommended that Indian River County utilize compact discs ( CD- R / CD- RW) and DVD-R discs as the transfer media of choice . Writeable CDs and DVDs should be utilized for data sharing and distribution , depending on which type of media can be utilized by those receiving the data . Using these two types of media will allow for flexibility when sharing data with or receiving data from other entities . Writeable CDs can be used for data sharing between all types of computers , as almost all computers today come standard with a CD- ROM drive . Therefore, any data written with the writeable CD- ROM drive can be used on any PC with a CD-ROM drive . While DVDs are not used as commonly as CDs , DVDs offer greater storage capacity and the ability to transfer large data sets that would usually need to be divided into multiple CDs . DVD-R use is increasing , and it is expected that this type of media will become as popular as CDs in the future . A majority of internal data sharing at Indian River County will be done through Indian River County ' s high-speed network. Data sharing through the network eliminates the need for sharing via disk or tape . Sharing Data via the Internet An excellent way of sharing data is via the Internet . Sharing data through the Internet precludes the need to use tape drives and tape formats to transfer data . However, there 6- 10 GIS Needs Assessment and Implementation Plan Chapter 6 - Data Standards and Transfer