2500 SX/20  (250-4077)     Hard Drive Installation      Faxback Doc. # 1113

Use the following procedure to install a 3 1/2" hard drive. Refer to the 
drive installation guide for instructions on adjusting drive components,
connecting the drive cable, and selecting mounting holes on the drive. You 
will also need information from the disk media error map or the drive
installation guide to run SetupSX after installing the drive. Record this
information on the system worksheet at the end of this manual.

1. Open the computer to gain access to the 3 1/2" drive bay.
2. Select the appropriate mounting holes one the drive.
3. Slide the drive into the 3 1/2" drive bay. With the drive resting on the
   center rail, align the mounting holes on the side of the drive with the 
   two mounting holes on the side of the carriage.
4. Mount the drive in the bay by installing the screws as illustrated.
5. Attach the remaining cable connector to the SmartDrive connector on the
   main logic board. Attach a power cable from the computer power supply, if
   necessary. Refer to "Completing the SmartDrive Installation" for 
   additional instructions.
6. Run the SetupSX utility to update your system configuration by 
   identifying the drive. The setup configuration screen displays several 
   drive descriptions. Select the drive description that matches the 
   information you recorded on  the worksheet. If you do not find an exact
   match, enter the drive type number, number of heads and cylinders, and 
   head and cylinder numbers  or defective tracks you recorded earlier. 
   Refer to "SetupSX" in the "Utilities" section form more information.
7. Format the hard drive with the computer positioned as you plan to use it
   (either on its side or flat). Refer to "Completing the SmartDrive
   Installation" for additional information.

Caution: After installing the hard drive, it might be necessary to park the
drive heads before opening the carriage or moving the computer. Refer to the
installation guide for information about securing drive heads.

Completing the Smartdrive Installation:

A SmartDrive (IDE hard disk drive) is a hard disk drive with a built-in
controller. Because controller usually occupies an expansion slot, using a
SmartDrive frees an expansion slot for some other use and saves you the cost
of a separate controller, providing maximum performance and guaranteed
compatibility at a lower cost than other drive/controller combinations.

To install a SmartDrive:

* Install the drive as described in "Installing a 3 1/2" Hard Drive". To
  install a 3 1/2" SmartDrive in the 5 1/4" bay, use the mounting holes on
  the bottom of the drive. Refer to "Installing a 3 1/2" Drive in the 5 1/4"
  Bay" for instructions.
* Connect a SmartDrive data/controller cable between the SmartDrive and the
  40-pin SmartDrive connector on the main logic board. The data/controller
  cable supports up to two SmartDrives. The SmartDrive cable and connector are 
  keyed to ensure that they connect properly.
* Connect a power cable from the power supply to the power connector on the
  hard drive.

To connect an unkeyed IDE cable, align Pin 1 of the cable connector with 
Pin 1 of the main logic board connector and then press the cable connector 
onto the main logic board connector. Some cables have a stripe on one side.
This stripe indicates Pin 1 one the cable connector. On the main logic 
board, a dot number 1 is printed next to Pin 1 of the main logic board
connector.

After installing a SmartDrive (or any hard disk drive), run the SetupSX
utility to update your system configuration. To run SetupSX, insert MS-DOS
Disk 1 into Drive A and turn on the computer.

After you reset the computer, you must partition, high-level format, and set
up MS-DOS 5.0 Setup program on Disk 1. You can do this by running the MS-DOS
5.0 Setup program on Disk 1. You can also use the fdisk and format commands to
format and partition a hard disk. The MS-DOS 5.0 documentation (25-4177) is
available at Radio Shack stores.

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