Seagate ATA Interface Disc Drives ST94811A User Manual

Note. For mobile system operation, use cable select (default) or master.  
Drive is master (or single drive)  
Drive is slave  
Momentus Installation Guide  
ST94011A, ST94811A, ST92011A, and ST92811A  
ATA Interface Disc Drives  
Cable select  
Publication Number: 100271723, Rev. B, April 2004  
The easiest way to install your drive  
Many of today’s mobile computers have been designed to make it possible  
for the end user to replace the hard drive. Refer to your system’s user man-  
ual for the location of the hard drive compartment and the specific instruc-  
tions regarding replacement.  
Figure 1.  
Jumper settings  
Drive mounting  
You can mount the drive using four screws in the side-mounting holes or  
four screws in the bottom-mounting holes. See Figure 2 for drive mounting  
dimensions. Follow these important mounting precautions when mounting  
the drive:  
Some mobile systems are sealed and require specialized tools to gain  
access to the hard drive.  
Caution. Special training or tools may be needed to service some mobile  
computers. In some cases, opening the case may void your war-  
ranty. Consult your system documentation.  
• Allow a minimum clearance of 0.030 inches (0.76 mm) around the entire  
perimeter of the drive for cooling.  
• Use only M3 UNC mounting screws. (Reusing the existing screws may  
be acceptable provided the maximum screw penetration depth of 0.098  
inches is not exceeded.)  
• Gently tighten the mounting screws (maximum torque: 4.0 in-lb).  
• Four (4) threads (0.080 inches) minimum screw engagement recom-  
mended.  
Seagate recommends taking your system to an authorized service techni-  
cian to replace your hard drive.  
Refer to your system manufacturer’s support website for the most up-to-  
date information. Read and follow all instructions regarding the proper  
steps to be taken when replacing the systems hard drive.  
What you need  
• A Phillips screwdriver  
3.945 +/-0.0098  
(100.2 +/-.25)  
.157  
(3.9878)  
0.490 +/- .010  
(12.446 +/- .254)  
• Existing drive mounting screws (reuse)  
• Existing drive mounting framework, cage or tray (reuse)  
ATA interface adapter (built into notebook and laptop systems)  
.399  
(10.135)  
0.680 +/- .010  
(17.27 +/- .254)  
Breather Hole  
Do not cover  
or seal.  
Handling precautions/electrostatic discharge protection  
• Disc drives are fragile. Do not drop or jar the drive. Handle the drive only  
by the edges or frame. Keep the drive in the electrostatic discharge  
(ESD) bag until you are ready to install it to minimize handling damage.  
• Drive electronics are extremely sensitive to static electricity. While  
installing the drive, wear a wrist strap and cable connected to ground.  
Turn off the power to the host system during installation.  
• Do not disassemble the drive. Doing so voids the warranty. See the war-  
ranty information on page 2.  
2.750 +/- .0098  
(69.85 +/- .25)  
inches  
(mm)  
Recommended case  
temp. measurement location  
3.567  
(90.602)  
• Do not apply pressure or attach labels to the circuit board or to the top of  
the drive.  
2X M3 X 0.5-6H  
Mounting holes  
Both sides  
.551  
(13.99)  
.12 min. full thread  
.374 +/- .0078  
(9.5 +/- .2)  
Drive characteristics  
ST94011A  
40 Gbytes  
78,140,160  
2 Mbytes  
ST92011A  
20 Gbytes  
39,070,080  
2 Mbytes  
2X .118  
Both sides  
Formatted capacity  
Total number of sectors*  
Cache size  
3.567  
(90.60)  
4X M3 X 0.5-6H  
Mounting holes  
.10 min. full thread  
.551  
(13.99)  
ST94811A  
40 Gbytes  
78,140,160  
8 Mbytes  
ST92811A  
20 Gbytes  
39,070,080  
8 Mbytes  
Formatted capacity  
Total number of sectors*  
Cache size  
2.430  
(61.722)  
*One sector equals 512 bytes.  
Replacing the existing hard drive  
Each system has its own unique hard drive compartment. Refer to your  
system manual to locate the hard drive compartment and for instructions  
on removing and replacing the hard drive.  
.160  
(4.06)  
Warning. Turn off the computer. If you have a notebook or laptop com-  
puter, disconnect the power charger/adapter and remove the  
battery before you open the case or touch any internal compo-  
nents.  
Note. This drive is designed for a host computer that supplies interface  
signals and +5V power through a single 44-pin connector. Most  
mobile computers have a fixed connector that attaches directly to  
the drive.  
Figure 2.  
Mounting dimensions—end, top, side, and bottom views  
Configuring the BIOS  
After completing the drive installation, restart your computer. Your com-  
puter may automatically detect your new drive. If your computer does not  
automatically detect your new drive, follow the steps below.  
1. Restart your computer. While the computer restarts, run the system  
setup program (sometimes called BIOS or CMOS setup). This is usu-  
ally done by pressing a special key, such as DELETE, ESC, or F1 dur-  
ing the startup process.  
2. Within the system setup program, instruct the system to auto detect  
your new drive.  
Setting the jumpers  
Refer to the jumper settings in Figure 1 or on your drive label to configure  
the drive for your system. Jumper settings can also be accessed online  
3. Save the settings and exit the setup program.  
Master or single drive: Use the options jumper block shown in Figure 1 to  
configure the drive for operation. This jumper block is the 4-pin header  
adjacent to pins 1 and 2 of the I/O signal pins.  
When your computer restarts, it should recognize your new drive. If your  
system still doesn’t recognize your new drive, see the troubleshooting  
section on this sheet.  

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