Fujitsu PRIMERGY BX900 S1 Operating Manual page 58

Installation and operation
ID card
You can pull out the ID card (see figure 12) as far as it will go and push it back
in again.
Figure 12: ID card in system unit
The ID card contains various system information, such as the product name,
serial number and order number (in the Japanese market, only the product
name and the serial number).
58 Operating Manual
BX900 S1