Lab 5 Floppy Dr

Home Up Objectives Sat AM Assignments Sound & Multi-Media Hard Drive Info Hard Dr Lab #1 Slides on Current Power Supply Notes Lab 10 Power S Lab11 Diags PC R II Sat Grades PC Repair II Labs Lab1 CDROM Lab 2 FDISK & P M Lab3 Upgrade HD Lab 4, Drive Image. Lab 5 Floppy Dr Lab 6 Memory Lab 7 Sound Card Lab 8 PC Prices Lab 9 Multimeter

 (Covers Chapters 9, 11, and 14)

Building Skills


The following exercises will help you build your skills in working hard drives and floppy drives.

Exercise 1: Reading Assignment

Read Chapters 9,14, and 11 of the textbook.

Exercise 2: Identify Floppy Drive Components

Exercise 3: Installing a Floppy Disk Drive

Exercise 2: Identify Floppy Drive Components

Figure 3.1 shows an exploded view of a floppy drive. Identify and label each component of the floppy drive using the provided boxes.

Exercise 3: Installing a Floppy Disk Drive

If you have the hardware available to you, install a floppy disk drive into an existing PC. You don't need to buy a new controller card if you have an AT-type computer; the disk controller that came with the computer can control both low- and high-density floppy disk drives. In fact, the computer probably came with a 1.44M, 3.5-inch drive. Only in rare cases do you need to get a newer BIOS chip. Sometimes, an older BIOS will not support the 720K or 1.44M drives.


If you want to install a 2.88M drive, you may need to upgrade your BIOS to support it.


Check off each step as you complete it.

1.         Make sure that you are using a OS version that supports the new drive.

To use a 1.44M floppy disk drive, you need to have DOS version 3.3 or higher. To use a 1.2M floppy disk drive, you need DOS 3.0 or higher. It is recommended that you use DOS 6.22 or Windows. (You can either use the “Restart Computer in MS-DOS Mode” option from the “Shut Down” dialog box, or open a DOS window by going to the Start Menu, and then to “Run” and type in either “command” for Windows 9x or “cmd” in Windows NT.) From the DOS prompt, type VER and press Enter. The version number that the computer uses is displayed onscreen. If the version is older than the versions mentioned here, you need to first install the new operating system.

2.         Turn off the computer, unplug its cables, and open the case.

3.         Guard yourself against ESD by using either an ESD wrist strap or workstation.

4.         If you need to replace an existing drive, remove it.

Usually, four screws hold the drive in place. Remove these screws and then disconnect both the data and power cables that are connected to this drive.

5.         Occasionally, you might have to set a drive select jumper to tell each floppy disk drive which drive it is.

These positions can be either DS0 through DS3 or DS1 through DS4. If there is a twist in the controller cable, you can skip this step. Most drives come with this jumper set in the second position, which is correct for most computers. If you are using a cable with no twist, you have to change this setting on one of the drives. If the cable supports only one drive, set the drive to the first drive-selecting position.

6.         Set the terminating resistor, if necessary.

Some 5.25-inch drives have a terminating resistor that is needed on only the last floppy disk drive. This terminating resistor is a plug-in DIP (dual inline pin) chip. The drive manual should indicate where this resistor is located (if you did not receive a manual, visit the manufacturer’s Web site; generally drive manuals are readily downloadable). This terminator must either be removed or disabled from the second drive (the one attached to the cable's middle connector). Some drive manufacturers might use a jumper or series of switches to turn off the resistor. The first drive that is attached to the end of the data cable needs to have a terminating resistor in place. Otherwise, it sends twice the current to the controller card, which slowly ruins it.

7.         Install the floppy disk drive.

Unless you are swapping one drive out for another, you first have to remove a cover plate over the drive bay where the drive is to be placed. Next, slide the new drive into the empty bay. If you are adding a 3.5-inch drive, you might have to place it into an adapter to fit it into a 5.25-inch wide drive bay. Make sure that the floppy disk drive is facing the right way. One way to ensure this is to make sure that the electronic circuitry of the drive is facing down. After the drive is in place, use the mounting hardware (usually four screws) to hold the drive in place. In some computers, plastic drive rails are used to mount floppy disk drives. If the drive didn't come with the proper mounting hardware, you can get a universal installation kit from most computer vendors. Tighten the screws only after the drive is flush with the other drives in the computer or the front bezel.

8.         Attach the controller cable to the new floppy disk drive.

Flat ribbon cables must be connected to each floppy disk drive so that it can "talk" to the onboard controller. This data cable carries the information from the floppy disk drive to the controller, and then to the rest of the computer. The controller cable might have two pairs of connectors. Each pair supports either a header connector or an edge connector. The pair nearest the end of the cable is for drive A, the drive that is desirable as the first drive. The other pair of connectors is attached to drive B, the second drive.


If you are installing a new or replacement second drive and want it to be drive A, you might want to rearrange the drives in the bays so that this drive is on top. Otherwise, the order of the installed drives doesn't matter.

In some cases, you might have only one connector per drive. If the connector doesn't fit the drive, the drive kit probably came with an adapter. If not, you can either use another cable to accommodate the odd connector, or you can purchase an insulation-displacement, 34-conductor header connector. This connector can be attached with a pair of pliers.

Again, one edge of this cable has a colored stripe. This stripe needs to be plugged into the connector at the back of the floppy disk drive with the colored stripe nearest pin 1 (or 0). If you are plugging in a 3.5-inch drive with a header connector, look at the PC board at the back of the drive. The connector pins will be labeled 1 through 34 (or 0 through 33). The stripe on the cable needs to be plugged in near the pin 1 (or 0) designation. Most cables are keyed to fit only one way.

9.         You now need to connect a power cable to the drive.

If you have only one drive, look for a spare power cable coming from the power supply. This is a four-wire connector with a white plastic plug. Plug it into the four-pin power connector at the rear of the floppy disk drive. This connector is shaped so that the cable fits only one way.

10.        With the cover off, turn on the computer and tell the computer about the new drive.

As the computer warms up, the new floppy disk drive light might come on, which is a good sign. You now must tell the computer what type of drive you have just installed. Upon warming up, the computer usually recognizes that something has changed and displays an error message. At that point, you can access the computer's setup program and make the changes. On older (legacy) computers, this setup program is on a floppy disk. On newer computers, the setup program is built into the BIOS. To get to the setup program, you either press a key or two or run a software program that came with the PC. For example, you might have to press Delete, Escape, or F1 as the computer warms up. The key combination is usually displayed during the boot process. If not, consult the computer owner's manual. Sometimes the computer will guess at the change and simply have you approve the changes to the setup program.

11.        Test the drive.

After you have installed the drive, insert a floppy disk and format it. If the disk comes out formatted to 360K or 720K, rather than the higher density, BIOS probably doesn't support the drive.  If you have bad sectors, try another disk.  If you still have the same bad sectors you may have a bad drive.

When the drive works properly, return the computer to normal operation.

Coming to Terms

Using the UPGRADE.HLP file, locate each of the following terms and, in your own words, write a short definition for each.

1.         head actuator

2.         high-level format

3.         low-level format

3.         partitioning

4.         platter

5.         high-density (HD)

10.        jumpers

11.        track

12.        track density



Home Objectives Sat AM Assignments Sound & Multi-Media Hard Drive Info Hard Dr Lab #1 Slides on Current Power Supply Notes Lab 10 Power S Lab11 Diags PC R II Sat Grades PC Repair II Labs Lab1 CDROM Lab 2 FDISK & P M Lab3 Upgrade HD Lab 4, Drive Image. Lab 5 Floppy Dr Lab 6 Memory Lab 7 Sound Card Lab 8 PC Prices Lab 9 Multimeter