Apple 250 manual Environmental Specifications, Housing Requirements

C H A P T E R 2

Hardware Modifications

Environmental Specifications

Table 2-2 provides a summary of environmental specifications for the 200 MB hard disk drive.

Table 2-2Environmental specifications for 200 MB hard disk drive

Category Condition Specification

Temperature of ambient air inside a low airflow thermal chamber, non-condensing

Temperature gradient

Relative humidity

Operating limits:	5 to 55 degrees C
Nonoperating
and storage:	-40 to 60 degrees C
Operating:	20 degrees C per hour
Non-operating:	Below rate causing condensation
Operating:	10–90%, noncondensing, maximum
	wet bulb 20 degrees C

	Non-operating:	Noncondensing, maximum wet bulb
		35 degrees C
Altitude	Operating:	–200 to 15,000 feet
	Shipping:	–200 to 15,000 feet

Housing Requirements

The PowerBook Duo 250 computer accommodates either a 120 MB or a 200 MB hard disk drive. The hard disk drive is housed in the PowerBook Duo 250 clamshell housing. Mounting and installation requirements for the 120 MB drive are exactly the same as the requirements described in Chapter 3 of the Macintosh Developer Notes, Number 2, Macintosh Duo System.

The 200 MB drive is mounted in the same way as the 120 MB drive but has slightly different dimensions. Figure 2-1 shows the dimensions of the 200 MB hard disk. The height of the disk drive is critical, and it must not exceed 0.75 inches. The drive may be mounted through either side-mounting or bottom-mounting holes machined into the disk drive housing. A bracket, shown in Figure 2-2, is attached to the side of the hard disk and holds it in place in the PowerBook Duo 250 computer housing.

8 200 MB Hard Disk Drive