12.3.1 I/O station and magazine Figure 12-5 shows the right side I/O station and magazine door. I/O stations are on the right side of the front panel of the library to enable the inserting and  removing of cartridges without interrupting normal library operations. An expansion module’s  I/O station has a capacity of up to five cartridges, depending on where it is located. If it is the  lowest module in the rack for the library, it has only four I/O slots available.  Individual I/O station elements cannot be shared between logical libraries. Importing or  exporting cartridges in a logical library without an assigned I/O station requires magazine  access, which takes the whole library offline. When an operator places cartridges in the I/O station and closes it, the library scans the slots  to update the library inventory. Cartridges should then be moved to storage slot locations by  using the Web User Interface (Web UI) or your backup application. Using the Web UI,  cartridges can be moved from one logical library’s  I/O station slot to a storage slot in another  logical library. However, a warning alert box is shown and the action must be confirmed. To unlock the I/O station, click  Library  Modules and Magazines  Actions  Unlock  I/O Station  from the management interface. The station can then be opened by pulling on the  magazine access handle. The magazine I/O button LED will indicate status of the I/O and  magazine, as shown in Table 12-2.  Chapter 12. IBM TS4300 tape library  317 Table 12-2 Magazine state Figure 12-5 I/O door and Magazine Magazine state LED state Description Closed Steady ON I/O station is enabled Closed Slow Flash Magazine open is in process Closed Fast Flash Magazine is opened Closed OFF I/O station is not enabled Opened OFF Magazine is opened