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Service Reference Guide, dx5150 361685-001 4–5
Serial and Parallel ATA Drive Guidelines and Features
The drive attached to a channel must have a drive designation. If a drive is attached to the
Device 0 cable position and its cable-select jumper is present, the drive is designated as Device
0. Similarly, if a drive is attached to the Device 1 cable position and its cable-select jumper is
present, the drive is designated as Device 1.
For optimal performance of a computer system, all drives need to be attached to the PATA
channel(s) in a specified sequence. This sequence is determined by the device class of the drives
and by specific attach sequence rules.
4.3.1 PATA Device Classes
To determine the best drive attach sequence, ATA/ATAPI drives are segregated into four
different classes based upon the bandwidth demands they place on an ATA channel. The most
demanding devices are in Class 1 and the least demanding are in Class 4.
General Attach Guidelines
■ The lower the device class number, the faster the device and the more bandwidth required.
■ A drive installed in the Device 0 position receives the greatest possible bandwidth.
4.4 ATA SMART Drives
The Self Monitoring Analysis and Recording Technology (SMART) ATA drives for the HP
Personal Computers have built-in drive failure prediction that warns the user or network
administrator of an impending failure or crash of the hard drive. The SMART drive tracks fault
prediction and failure indication parameters such as reallocated sector count, spin retry count,
and calibration retry count. If the drive determines that a failure is imminent, it generates a fault
alert.
4.5 Drive Capacities
The combination of the file system and the operating system used in the computer determines the
maximum usable size of a drive partition. A drive partition is the largest segment of a drive that
the operating system can properly access. Therefore, a single hard drive can be subdivided into a
number of unique drive partitions in order to make use of all of its space.
Because of the differences in the way that drive sizes are calculated, the size reported by the
operating system may differ from that marked on the hard drive or listed in the computer
specification. Drive size calculations by drive manufacturers are bytes to the base 10 while
calculations by Microsoft are bytes to the base 2.
Class 1
Hard
Drives
Class 2
High Speed
Optical Drives
Class 3
Optical Storage
Drives
Class 4
Magnetic
Storage Drives
Only MultiBay
hard drive is
supported
DVD
DVD-CD R/W
R/W CD-ROM
CD-ROM
Zip
- 1st edition 1
- Service Reference Guide 3
- First Edition (April 2005) 4
- Contents 5
- 1.4 Converting to NTFS 10
- 1.5 HP Software 11
- Setup screen 15
- 2.2.2 Computer Setup Menu 16
- Computer Setup (Continued) 17
- 2.3.1 Backing up the CMOS 20
- 2.4 Diagnostics for Windows 21
- 2.5 Configuration Record 25
- 2.7 Protecting the Software 26
- 2.8 Restoring the Software 26
- Desktop Management 27
- 3.3.3 System Software Manager 29
- 3.4 ROM Flash 30
- 3.4.2 HPQ Flash 31
- 3.4.3 FailSafe Boot Block ROM 31
- 3.4.4 Replicating Your Setup 31
- 3.4.5 Dual-State Power Button 34
- 3.4.6 World Wide Web Site 35
- Security Features Overview 36
- 3.5.1 Password Security 37
- Entering a User Password 38
- Clearing Passwords 39
- 3.5.6 Cable Lock Provision 41
- 3.6.2 Thermal Sensor 41
- Guidelines and Features 43
- 4.1.2 SATA Power Cable 44
- 4.2.1 PATA Data Cable 45
- 4.2.2 PATA Power Cable 45
- 4.2.3 PATA Cable Layout 46
- 4.4 ATA SMART Drives 47
- 4.5 Drive Capacities 47
- 4.6 SATA BIOS 48
- 4.6.2 Native Mode 49
- Disassembly Preparation 51
- 5.2.1 Generating Static 53
- 5.2.4 Grounding the Work Area 54
- 5.3 Operating Guidelines 55
- 5.4 Routine Care 55
- 5.4.3 Cleaning the Keyboard 56
- 5.4.4 Cleaning the Monitor 56
- 5.5 Service Considerations 57
- 5.5.4 Cables and Connectors 58
- 5.5.5 Hard Drives 58
- Microtower (MT) Chassis 61
- 6.2.2 Installing a Padlock 62
- 6.3 Access Panel 63
- 6.4 Front Bezel 64
- 6.5 Front Drive Bezels 65
- 6.5.2 Diskette Drive Bezel 66
- 6.6 Cable Management 67
- 6.6.1 Cable Connections 68
- 6.7 Memory Modules 69
- 6.8 Expansion Cards 70
- 6.8.2 PCI Expansion Card 71
- 6.9 Drives 73
- 6.9.2 Removing a Drive 74
- Releasing the Drives 76
- 6.9.3 Installing a Drive 77
- Connecting Hard Drive Cables 79
- 6.10 Chassis Fan 80
- ❏ power switch/LED cable 81
- ❏ front USB cable 81
- ❏ front audio cable 81
- 6.12 Front I/O Devices 82
- 6.13 Power Switch Assembly 83
- 6.14 Heatsink 85
- 6.15 Processor 86
- 6.16 System Board 87
- 6.17 Battery 89
- 6.17.1 Type 1 Battery Holder 90
- 6.17.2 Type 2 Battery Holder 91
- 6.17.3 Type 3 Battery Holder 92
- 6.18 Speaker 93
- 6.19 Power Supply 94
- 7.2.1 C a bl e Loc k 96
- 7.2.2 Padl oc k 97
- 7.4 Front Bezel 99
- 7.5 Front Drive Bezels 100
- 7.6 Memory Modules 101
- 7.7 PCI Expansion Card 102
- 7.8 Drives 104
- 7.8.2 Cable Management 105
- 7.8.3 Cable Connections 107
- 7.8.4 Optical Drive 108
- ❏ Audio cable 1 110
- ❏ Flat ribbon data cable 2 110
- ❏ Power cable 3 110
- 7.8.6 Primary Hard Drive 113
- 7.9 Front I/O Devices 115
- 7.10 Power Switch Assembly 116
- 7.11 S pe aker 117
- 7.12 C h assi s Fan 118
- 7.13 B a t ter y 119
- 7.13.1 Type 1 Battery Holder 120
- 7.13.2 Type 2 Battery Holder 121
- 7.14 Heatsink Assembly 122
- 7.15 Proc essor 123
- 7.16 Sys tem B oard 124
- 7.17 Power Su p p ly 126
- Connector Pin Assignments 127
- Ethernet RJ-45 128
- Ethernet AUI 128
- Parallel Interface 128
- Microphone 129
- Headphone 129
- Line-In Audio 129
- Line-Out Audio 130
- Ultra SCSI 130
- External Infrared Transceiver 131
- 24-Pin Power 132
- 24-Pin MicroFit Power 133
- 4-Pin Power (for CPU) 133
- PCI Express 134
- Power Cord Set Requirements 137
- Country-Specific Requirements 138
- POST Error Messages 139
- Preliminary Checklist 147
- Solving Minor Problems 148
- Solving Power Supply Problems 151
- Solving Diskette Problems 152
- Solving Hard Drive Problems 154
- Solving Display Problems 157
- Solving Audio Problems 160
- Solving Printer Problems 162
- Solving Keyboard Problems 163
- Solving Network Problems 166
- Solving Memory Problems 168
- Solving Processor Problems 169
- Solving Drive Key Problems 171
- Solving Software Problems 173
- AMD-Based Systems 175
- DIMM Sockets 176
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