|  |  |  | ACP-4320MB-00BE | ACP-4320MB-40BE | 
        
            | Disk Drive Bay | 5.25 External Bay | 2 | 2 | 2 | 2 | 
        
            | 3.5" Front-Accessible | 2 (compatible with 3.5" or 2.5" devices) | 2 (compatible with 3.5" or 2.5" devices) | 2 (compatible with 3.5" or 2.5" devices) | 2 (compatible with 3.5" or 2.5" devices) | 
        
            | Cooling | Fan | 1(12 cm/74 CFM) + 1 (6cm / 28 CFM) | 1(12 cm/74 CFM) + 1 (6cm / 28 CFM) | 1(12 cm/74 CFM) + 1 (6cm / 28 CFM) | 1(12 cm/74 CFM) + 1 (6cm / 28 CFM) | 
        
            | Air Filter | Yes | Yes | Yes | Yes | 
        
            | System Fan | System fan speed referring to chassis thermal sensor, or CPU temperature | System fan speed referring to chassis thermal sensor, or CPU temperature | System fan speed referring to chassis thermal sensor, or CPU temperature | System fan speed referring to chassis thermal sensor, or CPU temperature | 
        
            | Front I/O Interface | USB2.0 | 2 | 2 | 2 | 2 | 
        
            | Miscellaneous | LED Indicators | Power, HDD, temperature, fan, LAN1, and LAN2 | Power, HDD, temperature, fan, LAN1, and LAN2 | Power, HDD, temperature, fan, LAN1, and LAN2 | Power, HDD, temperature, fan, LAN1, and LAN2 | 
        
            | Rear Panel | One 9-pin D-Sub opening | One 9-pin D-Sub opening | Five 9-pin D-Sub & one 68-pin SCSI openings | Five 9-pin D-Sub & one 68-pin SCSI openings | 
        
            | Intelligent System Module | Remote Monitoring | CPU/System fan speed , CPU/System temperature , motherboard voltage | CPU/System fan speed , CPU/System temperature , motherboard voltage | CPU/System fan speed , CPU/System temperature , motherboard voltage | CPU/System fan speed , CPU/System temperature , motherboard voltage | 
        
            | Environment | Operational Temperature | 0 ~ 40° C (32 ~ 104° F) | 0 ~ 40° C (32 ~ 104° F) | 0 ~ 40° C (32 ~ 104° F) | 0 ~ 40° C (32 ~ 104° F) | 
        
            | Non-Operational Temperature | -20 ~ 60° C (-4 ~ 140° F) | -20 ~ 60° C (-4 ~ 140° F) | -20 ~ 60° C (-4 ~ 140° F) | -20 ~ 60° C (-4 ~ 140° F) | 
        
            | Operating Humidity | 10 ~ 85% @ 40° C, non-condensing | 10 ~ 85% @ 40° C, non-condensing | 10 ~ 85% @ 40° C, non-condensing | 10 ~ 85% @ 40° C, non-condensing | 
        
            | Non-Operating Humidity | 10 ~ 95% @ 40° C, non-condensing | 10 ~ 95% @ 40° C, non-condensing | 10 ~ 95% @ 40° C, non-condensing | 10 ~ 95% @ 40° C, non-condensing | 
        
            | Operating Vibration (5 ~ 500 Hz) | 1 Grms | 1 Grms | 1 Grms | 1 Grms | 
        
            | Non-Operating Vibration (5 ~ 500 Hz) | 2 G | 2 G | 2 G | 2 G | 
        
            | Operating Shock | 10 G (with 11 ms duration, half sine wave) | 10 G (with 11 ms duration, half sine wave) | 10 G (with 11 ms duration, half sine wave) | 10 G (with 11 ms duration, half sine wave) | 
        
            | Non-Operating Shock | 30 G | 30 G | 30 G | 30 G | 
        
            | Physical Characteristics | Dimensions (W x H x D) | 482 x 177 x 479 mm (19" x 7" x 18.9") | 482 x 177 x 479 mm (19" x 7" x 18.9") | 482 x 177 x 479 mm (19" x 7" x 18.9") | 482 x 177 x 479 mm (19" x 7" x 18.9") | 
        
            | Weight | 17.6 kg (38.7 lb) | 17.6 kg (38.7 lb) | 17.6 kg (38.7 lb) | 17.6 kg (38.7 lb) |