UPGRADING REPAIRING PCs
UPGRADING REPAIRING PCs UPGRADING REPAIRING PCs
160 Table 5.13 High-Performance Tape Backup Standards Compared Continued Chapter 5—Floppy, Removable, Tape, and Flash Storage Capacity/2:1 Backup Speed (Native/ Drive Price Media Drive Type Compressed Compressed) Range Cost ADR 50GB 25GB/50GB 2–4MB/sec SCSI;4–8MB/sec LVD SCSI $699–$949 $60 AIT-2 50GB/100GB 6–12MB/sec $3000–$3200 $110–$120 DLT 2000 15GB/30GB 1.2–2.5MB/sec $1200–$1300 $30–$50 DLT 4000 20GB/40GB 1.5–3MB/sec $1300–$1850 $60–$75 DLT 7000 35GB/70GB 5–10MB/sec $4300–$4700 $70–$90 Successful Tape Backup and Restore Procedures A backup tape might be the only thing separating you from a complete loss of data. To ensure that every backup can be restored, follow the guidelines shown in Tables 5.14 and 5.15 when you create a backup or restore one. Table 5.14 Tape Backup Tips Tip Benefit Notes Perform the Tests DMA channels in Keep a spare blank tape at all times confidence test computer for safe data to enable you to perform this test during tape transfer; sets default whenever new hardware is installed backup software transfer rate for backup. or before running a new backup for installation. safety. Select the “Full” backup backs up Make a disaster recovery backup correct backup contents of system, but and test your ability to restore your type. operating system must backup to an empty hard drive. be restored first before Use other backup types for restoring backup. “Disaster Recovery” backup creates special boot disks and enables entire system recovery straight from tape to an empty hard drive. Other backup types are designed primarily for data backup. periodic backups. Choose speed Maximum data and safety. compression uses the least amount of tape and is often about as fast as other backup types. Use Compare after to ensure readability.
Table 5.14 Tape Backup Tips Continued Tape Backup Drives and Media 161 Tip Benefit Notes Don’t use Tape backups are typically Use actual compression ratio multiple tapes rated with 2:1 reported during your initial full for a single compression assumed; backup to determine your nominal backup. this ratio is seldom achieved. tape size. If your tape drive is a Using multiple tapes for Travan 3 or smaller, get extra a single backup can cause capacity per tape by using loss of data if first tape is Verbatim QIC-EX series tapes (see lost, because it contains tape catalog. Back up a large drive with a small tape drive by backing up sections. Table 5.15). Avoid Let the tape backup run Don’t use floppy drives because multitasking without interruptions, due floppy DMA 2 is often used during during the tape to DMA transfers. Turn off backups. backup. screensaver and power management. Turn off your monitor. Table 5.15 Tape Restore Tips Tip Benefit Restore full backups to an empty Avoids overwriting drive with junk data if drive if possible. your backup has failed. If your full backup is not a disaster You’ll wait less time before you can install your recovery type, install the smallest possible operating system image first. backup software and restore your backup. Run the confidence test again Verifies that DMA transfers will be successful; before you start the restore this requires a blank tape or one that can be process. overwritten, so keep one handy. Tape Drive Troubleshooting Tape drives can be troublesome to install and operate. Any type of removable media is more susceptible to problems or damage, and tape is no exception. This section lists some common problems and resolutions. After each problem or symptom is a list of troubleshooting steps. Can’t Detect the Drive For parallel-port drives, use the tape backup as the only device on the drive and check the IEEE-1284 (EPP or ECP) mode required by the drive against the parallel port configuration. For USB drives, be sure you’re using Windows 98 or higher and that the USB port is enabled in the BIOS; many systems originally shipped with Windows 95 have this port disabled.
- Page 127 and 128: Bus-Mastering Chipsets for IDE 109
- Page 129 and 130: Table 4.13 Bus-Mastering Chipsets b
- Page 131 and 132: Table 4.14 Other IDE Drive Installa
- Page 133 and 134: standard single-ended SCSI devices
- Page 135 and 136: SCSI Drive and Device Configuration
- Page 137 and 138: SCSI Drive and Device Configuration
- Page 139 and 140: Following these tips will help mini
- Page 141 and 142: SCSI Configuration Troubleshooting
- Page 143 and 144: Using FDISK 125 Using FDISK FDISK i
- Page 145 and 146: Benefits of Hard Disk Partitioning
- Page 147 and 148: How FDISK and the Operating System
- Page 149 and 150: How FDISK and the Operating System
- Page 151 and 152: Now, the operating system can use t
- Page 153 and 154: The command switches are explained
- Page 155 and 156: MS-DOS Command-Line Access to CD-RO
- Page 157 and 158: • Make sure the drive shows up as
- Page 159: Troubleshooting Optical Drives 141
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- Page 184 and 185: 166 Chapter 6—Serial Ports and Mo
- Page 186 and 187: 168 Table 6.2 25-Pin (PC, XT, and P
- Page 188 and 189: 170 Table 6.4 Overview of UART Chip
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- Page 204 and 205: 186 Chapter 6—Serial Ports and Mo
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- Page 208 and 209: 190 Chapter 7—Parallel Ports, Pri
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Table 5.14 Tape Backup Tips Continued<br />
Tape Backup Drives and Media 161<br />
Tip Benefit Notes<br />
Don’t use Tape backups are typically Use actual compression ratio<br />
multiple tapes rated with 2:1 reported during your initial full<br />
for a single compression assumed; backup to determine your nominal<br />
backup. this ratio is seldom achieved. tape size. If your tape drive is a<br />
Using multiple tapes for Travan 3 or smaller, get extra<br />
a single backup can cause capacity per tape by using<br />
loss of data if first tape is Verbatim QIC-EX series tapes (see<br />
lost, because it contains<br />
tape catalog. Back up a<br />
large drive with a small<br />
tape drive by backing up<br />
sections.<br />
Table 5.15).<br />
Avoid Let the tape backup run Don’t use floppy drives because<br />
multitasking without interruptions, due floppy DMA 2 is often used during<br />
during the tape to DMA transfers. Turn off backups.<br />
backup. screensaver and power<br />
management. Turn off your<br />
monitor.<br />
Table 5.15 Tape Restore Tips<br />
Tip Benefit<br />
Restore full backups to an empty Avoids overwriting drive with junk data if<br />
drive if possible. your backup has failed.<br />
If your full backup is not a disaster You’ll wait less time before you can install your<br />
recovery type, install the smallest<br />
possible operating system image<br />
first.<br />
backup software and restore your backup.<br />
Run the confidence test again Verifies that DMA transfers will be successful;<br />
before you start the restore this requires a blank tape or one that can be<br />
process. overwritten, so keep one handy.<br />
Tape Drive Troubleshooting<br />
Tape drives can be troublesome to install and operate. Any type of<br />
removable media is more susceptible to problems or damage, and<br />
tape is no exception. This section lists some common problems and<br />
resolutions. After each problem or symptom is a list of troubleshooting<br />
steps.<br />
Can’t Detect the Drive<br />
For parallel-port drives, use the tape backup as the only device on<br />
the drive and check the IEEE-1284 (EPP or ECP) mode required by<br />
the drive against the parallel port configuration.<br />
For USB drives, be sure you’re using Windows 98 or higher and that<br />
the USB port is enabled in the BIOS; many systems originally<br />
shipped with Windows 95 have this port disabled.
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