Transcript document

Chapter 7
Floppy Drives
You Will Learn…
 How floppy drives work
 How to manage floppy drives using Windows
Explorer
 How to exchange and support floppy drives
How Floppy Drives Work
 How data is physically stored on a floppy disk
 How the OS logically views that data
How Data Is Physically Stored on a
Floppy Drive
Floppy Drive Subsystem
Formatting a Floppy Disk
 Process of marking tracks and sectors to
prepare the disk to receive data
 Done using Windows Explorer shortcut menu
or the Format command from command
prompt
Tracks and Sectors on a Floppy
Inside a Floppy Disk Drive
Read/Write Head
How Data Is Logically Stored on a
Floppy Disk
 Cluster
• Smallest unit of data on a disk used to hold a file or
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a portion of a file
Describes how data is logically organized
Also called file allocation unit
Clusters
Formatting Process for
a Floppy Disk
 Creates tracks and sectors by writing:
• Tracks of F6s in hex
• Sector address mark to identify the beginning
sector on a track
 Creates the boot record
 Creates two copies of the FAT
 Creates the root directory
The Boot Record
 Information stored in the first sector on the
disk about how the disk is organized
• Number of sectors
• Number of sectors per cluster
• Number of bits in each FAT entry
The Boot Record
The File Allocation Table (FAT)
 Lists location of files on the disk in a onecolumn table
 Lists how each cluster (FAT) is currently used
The Root Directory Table
 Lists information about each file and
subdirectory stored in it
The Root Directory Table
How an OS Reads a File
Using Windows Explorer to Manage Floppy Disks
and Hard Drives
 Ways to open Windows Explorer
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Click Start, Programs, Windows Explorer
Right-click My Computer; select Explore
Right-click Start; select Explore from the menu
Open My Computer and, on the menu bar, click
View, Explorer Bar, Folders
My Computer View
Shortcut Menu Options
 Access with a right-click on the item
Shortcut Menu Options
Shortcut Menu Options
Create a New Folder
 Click on parent folder’s name
 Click File menu, Select New
 Select Folder from submenu
Delete a Folder
 Right-click the folder
 Select Delete from shortcut menu
File Attributes
 Right-click a file
 Select Properties from shortcut menu
 View or change attributes
File Attributes
Folder Properties
 Select folder, click Tools, Folder Options
 Click the View tab
 Change how and when files appear in the
folder
Exchanging and Supporting Floppy
Drives
 Problems that can occur with a floppy drive
and its support system
 How to replace the drive
 How to add an additional floppy drive to a
computer system
Replacing a Floppy Drive
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Check that computer and peripherals are working
Turn off computer and remove the cover
Unplug data cable and power cable from the old
drive; unscrew and dismount the drive
Slide new drive into the bay. Reconnect data cable
and power cable
Turn on computer, check setup, and test the drive
Replacing a Floppy Drive
Replacing a Floppy Drive
Replacing a Floppy Drive
Requirements for
Adding a New Drive
 Empty bay
 Extra power cable (or “Y” splitter)
 Extra connection on floppy drive data cable
When a Floppy Disk Drive Doesn’t
Work
 Error messages in the 600 range occur when a
floppy drive does not pass the POST test
 When troubleshooting, check:
• Physical condition of the disk
• Error messages
• CMOS settings
• Cables connected to the drive
Common Error Messages
 Non-system disk or disk error. Replace and
strike any key when ready.
 No operating system found
 Bad or missing COMMAND.COM
 Error in Config.sys line xx
 Himem.sys not loaded
 Missing or corrupt Himem.sys
continued…
Common Error Messages
 Incorrect DOS version
 Invalid Drive Specification
 Not ready reading drive A:, Abort, Retry, Fail?
 General failure reading drive A:, Abort, Retry,
Fail?
 Track 0 bad, disk not usable
 Write-protect error writing drive A:
Chapter Summary
 Main uses of floppy drives
• For troubleshooting a failed boot
• Quick and easy way to transfer small files from
one PC to another
 How data is stored on a floppy disk and how to
manage that data
 How to install a floppy disk drive on a PC