User`s guide
Table Of Contents
- About This Guide
- Kit Contents and System Requirements
- About Your RAID Controller
- Standard RAID Controller Features
- Adding Enhanced Features
- Adding a Battery Backup Module
- Upgrading the Controller Firmware
- About the Adaptec 3085
- About the Adaptec 3405
- About the Adaptec 3805
- About the Adaptec 31205
- About the Adaptec 31605
- About the Adaptec 4000
- About the Adaptec 4800SAS
- About the Adaptec 4805SAS
- About the Adaptec 2420SA
- About the Adaptec 2820SA
- About the Adaptec 2130SLP
- About the Adaptec 2230SLP
- Getting Started
- Installing the Controller and Disk Drives
- Creating a Bootable Array
- Installing the Driver and an Operating System
- Installing the Driver on an Existing Operating System
- Managing Your Storage Space
- Solving Problems
- Introduction to Serial Attached SCSI
- Understanding RAID
- Using the Adaptec RAID Configuration Utility
- Using the Array Configuration Utility for DOS
- Using the Adaptec Flash Utility
- Adaptec Serial Controller LED and I2C Connector Reference
- Adaptec 2420SA Activity LED and I2C Connector Specification
- Adaptec 2820SA Activity LED and I2C Connector Specification
- Adaptec 3085 LED and I2C Connector Specification
- Adaptec 3405 LED and I2C Connector Specification
- Adaptec 3805 LED and I2C Connector Specification
- Adaptec 31205 LED and I2C Connector Specification
- Adaptec 31605 LED and I2C Connector Specification
- Adaptec 4800SAS LED and I2C Connector Specification
- Adaptec 4805SAS LED and I2C Connector Specification
- Safety Information
- Technical Specifications
- Index

Chapter 3: About Your RAID Controller ● 26
About the Adaptec 2420SA
The Adaptec 2420SA is a SATA II RAID controller with these features:
Note: A low-profile bracket is included with this controller. However, this controller may not fit in
all low-profile systems.
Form Factor Half-size
Bus compatibility PCI-X, 3.3 V
PCI-X bus width 64-bit
PCI-X bus speed 133 MHz
Standard cache 256 MB
Connectors 4x SATA connector
RAID levels 0, 1, 1E, 5, 5EE, 6, 10
Simple volume Yes
Disk drives Up to 4 Serial ATA/Serial ATA II disk drives, 48-bit LBA supports
drives larger than 137GB
Maximum number of disk drives 4
Hot spares Yes
Automatic Failover Yes
Onboard speaker Yes
Audible Alarm Yes
Battery backup module Adaptec Battery Module 500 (sold separately—see page 17)
Mounting bracket
Mode 0 Flash
connector
LED connector
I2C connector
SATA ports
0
1
3
2
PCI-X connector
Battery connector
Activity LED
connector
PCI-X jumper
Charge LED
(for battery
backup module)
SUM Activity LED
0
1
2
3
Activity LED
Phy
Back side of Controller
IRQ LED
3,3V LED
Diag LEDs