Filed Pursuant to Rule 425

Profitability. Leadership. Growth.

May 2006

Filed

Quantum

Corporation

Pursuant

Rule

425

Under

the

Securities

Act

1933

And

Deemed

Filed

Pursuant

Rule

14a-12

Under

the

Securities

Exchange

Act

1934

Subject

Company:

Advanced

Digital

Information

Corporation

Commission

File

No.:

0-21103

not necessarily represent the company's outlook and is for planning purposes only.

Historical Perspective

•

25 years of storage experience and expertise: in 2001, began the

transition from hard drives to a new mission

•

Spent past several years re-engineering every aspect of the company

–

Legacy issues

–

Organization/infrastructure

–

Cost structure

–

Certance

acquisition & integration

–

Research & development in new products & platforms

–

Quality improvement

The largest independent provider of backup, recovery

and archive solutions

not necessarily represent the company's outlook and is for planning purposes only.

Financial Results Illustrate Progress

*Financial results reflect Income/loss from continuing operations

2 cents loss

7 cent profit

$13.0M

$230M

(29%)

32%

$794M

FY’05

36 cents loss

4 cents loss

($6.2M)

$250M

(31%)

33%

$808M

FY’04

23 cent loss

10 cent profit

$19.3M

$229M

(27.5%)

30%

$834M

FY’06

81 cents loss

GAAP EPS*

7 cents loss

Non-GAAP EPS**

($10.8M)

Net Income

(loss)*

$278M

(32%)

Opex

(% of Revenue)

32%

GM Rate

$871M

Revenue

FY’03

Non-GAAP**

**Non-GAAP

financial

measures

presented

here

are

not

prepared

accordance

with

GAAP.

For

presentation

the

GAAP

measures,

and

reconciliation

the

differences between the GAAP and non-GAAP measures, please visit the Investor Relations section of our website located at www.Quantum.com.

•

FY05 first full year of non-GAAP profit in 3 years

•

Focus on resolving legacy issues

•

Reassessed roadmap for new products and platforms

not necessarily represent the company's outlook and is for planning purposes only.

FY06 was a Pivotal Year

•

Develop an execution platform that facilitates success

–

Simplified business systems to one Oracle platform; consolidated

operations and manufacturing sites; consolidated engineering and

marketing functions; launched new Quantum.com site

•

Create the industry’s leading tape business

–

Launched 11 new products: SuperLoader3, PX500 Series, DLT-V4, SDLT

600A, DLT-S4, the Quantum security framework and more!

•

Build a promising growth platform

–

Launched StorageCare Guardian, DX3000, DX5000, DPM5500 and

GoVault

•

Settle legacy issues

–

Sun/STK lawsuit

–

All issues are resolved

not necessarily represent the company's outlook and is for planning purposes only.

Quantum’s Strategic Priorities

More diverse, differentiated and valuable storage market position

Increased customer value and better overall experience

Build on industry’s

leading independent

tape business

capitalizing on unique

position as developer

of tape drives, media

and automation

Create growth

platform

by moving

beyond tape with disk,

software and services

optimized for tiered

storage environments

Develop stronger

execution platform

that

facilitates success by

leveraging Quantum’s

breadth to create

sustainable cost and

quality advantages

not necessarily represent the company's outlook and is for planning purposes only.

A Transforming Transaction

The two leading, independent backup, recovery

and archive providers…

are joining together to create one of the

industry’s largest, independent storage

company and one that will provide customers

the most comprehensive and integrated range

of solutions for securely storing, managing,

protecting and recovering their data in open

systems IT environments

not necessarily represent the company's outlook and is for planning purposes only.

Transaction Summary

•

Expected 3 to 4 months after announcement

Closing

•

ADIC shareholder approval

•

HSR clearance

•

No financing condition

•

Other customary conditions

Conditions

•

Combined cash on hand of $320M

•

Debt of up to $500M

•

Obtained formal commitment from KeyBanc

Financing

•

$770 million, net of transaction expenses

Total Offer Value

•

$12.25 per share in cash or 3.461 shares of Quantum

stock for each ADIC share in lieu of cash.

•

Stock election is subject to pro-ration such that Quantum

will issue no more than 19.95% of its stock outstanding

Offer Price

not necessarily represent the company's outlook and is for planning purposes only.

Powerful Strategic Rationale

Enhances

financial

position

Expands

market

access

Stronger

growth

platform

not necessarily represent the company's outlook and is for planning purposes only.

Enhances Quantum’s Financial Position

•

Highly accretive to EPS

–

Up to 15 cents accretive to cash EPS in the first full year of combined

operations

•

Annual cost synergies of approximately $45 million, primarily from:

–

COGS economies of scale and manufacturing efficiencies

–

Reduction of duplicative operating expenses

–

Sharing of R&D and marketing costs

•

Higher margin revenue base

–

Quantum branded revenue ~ 30% vs. ADIC branded revenue ~ 60%

–

Increased service revenue

not necessarily represent the company's outlook and is for planning purposes only.

Market Access = Revenue Opportunity

•

Over 3000 employees

•

Significant global presence

•

Substantial customer access capabilities

–

3x the sales force and 2x the service sales force

–

Broad base of OEM relationships

–

Over 250 enterprise VARs

–

Over 5,000 VARs actively selling product each

quarter

–

Over 200,000 automation systems installed in last

four years

–

Almost 20,000 systems covered by service uplift

contracts

not necessarily represent the company's outlook and is for planning purposes only.

Dual Go-to-Market Approach

Workgroup Midrange Enterprise

Quantum Strengths:

•

Tape drives

and media

•

Low-end tape

automation

•

Removable

disk drives

•

Security

•

High volume channel

ADIC Strengths:

•

Enterprise tape

automation

•

Data management

software

•

Enterprise sales

expertise

•

Direct and vertical

accounts

•

EMEA and APAC field

coverage

Common strengths;

More critical mass

•

Midrange tape

automation

•

Disk-based backup

•

Services

•

OEM partnerships:

IBM, Dell, HP, Fujitsu

Siemens

not necessarily represent the company's outlook and is for planning purposes only.

Value Across the Channel

CRN Channel Chiefs

VAR Business 5 Star

Partner Program

Winner

VARBusiness

Top 100

Channel Executives

CRN Channel

Champions Finalist

•

Globally deployed solution & technical sales teams

delivering users and partners unequalled industry

expertise

•

Loyal enterprise VARs focused on delivering

comprehensive data storage, management,

protection and recovery solutions

•

Highly effective high-volume channel delivering

workgroup solutions through distribution

•

Recognized for best-in-class channel engagement,

support and programs

not necessarily represent the company's outlook and is for planning purposes only.

Award-Winning Global Services

Eight Technical

Assistance

Centers

Over 400 Strategic

Stocking

Locations

90 Countries

Covered

>50 Product Lines

Supported

>18k Contracts

2005, 2006

NorthFace Award

Customer Sat. Excellence

2006

SSPA STAR Award

Best Practices in Support

2004, 2005, 2006

SCP Certified

Support Effectiveness

2005

Positive Rating

Support / Acct. Management

Over 700 Service

Team Members

(+ Partners)

Leadership in

Enabling

Technology

(iSurety, Guardian)

not necessarily represent the company's outlook and is for planning purposes only.

Trusted by Global IT Leaders

not necessarily represent the company's outlook and is for planning purposes only.

Growth Opportunities

•

Data growth rates show no signs of slowing

•

Storage remains a top IT decision-maker priority

•

Regulatory compliance issues increase storage

complexity, risk and cost

•

Existing storage architectures no longer meeting

requirements

•

Users seeking trusted suppliers that can deliver

best-of-breed solutions

•

Constrained IT budgets dictate strong focus on

total cost of ownership

001011010010101010101010101000101010010101001001000100

100010001101110001011000001111001111010010111001001010

011011100010110000011110011110100101110010010101010101

000001001011010010101010101010101000101010010101001001

000100100010001101110001011000001111001111010010111001

001010101010100000100101101001010101010101010100010101

001010100100100010010001000110111000101100000111100111

101001011100100101010101010000010010110100101010101010

101010001010100101010010010001001000100011011100010110

000011110011110100101110010010101010101000001001011010

010101010101010101000101010010101001001000100100010001

101110001011000001111001111010010111001001010101010100

000101101110001011000001111001111010010111001001010101

010100000100101101001010101010101010100010101001010101

001011010010101010101010101000101010010101001001000100

100010001101110001011000001111001111010010111001001010

011011100010110000011110011110100101110010010101010101

000001001011010010101010101010101000101010010101001001

000100100010001101110001011000001111001111010010111001

001010101010100000100101101001010101010101010100010101

001010100100100010010001000110111000101100000111100111

101001011100100101010101010000010010110100101010101010

101010001010100101010010010001001000100011011100010110

000011110011110100101110010010101010101000001001011010

010101010101010101000101010010101001001000100100010001

101110001011000001111001111010010111001001010101010100

000101101110001011000001111001111010010111001001010101

010100000100101101001010101010101010100010101001010101

001011010010101010101010101000101010010101001001000100

100010001101110001011000001111001111010010111001001010

011011100010110000011110011110100101110010010101010101

000001001011010010101010101010101000101010010101001001

000100100010001101110001011000001111001111010010111001

001010101010100000100101101001010101010101010100010101

001010100100100010010001000110111000101100000111100111

101001011100100101010101010000010010110100101010101010

101010001010100101010010010001001000100011011100010110

000011110011110100101110010010101010101000001001011010

010101010101010101000101010010101001001000100100010001

101110001011000001111001111010010111001001010101010100

000101101110001011000001111001111010010111001001010101

010100000100101101001010101010101010100010101001010101

Unprecedented Opportunity for a Storage Industry Innovator to

Deliver Integrated Backup, Recovery and Archive Solutions

not necessarily represent the company's outlook and is for planning purposes only.

Total Storage Market

2006

CAGR%

Network Infrastructure

3.2

17.5%

Management Software

8.9

11.6%

Tape Devices / Systems

7.9

5.1%

Host-Attached Disk

7.3

-5.5%

Disk Arrays

18.4

5.8%

Total

45.7

5.3%

Recovery Storage Market

2006

CAGR%

Recovery Services

0.08

14.9%

Recovery Net. Infra.

1.3

23.8%

Recovery Mgmt. Software

5.3

12.0%

Tape Devices / Systems

7.9

5.1%

Recovery Disk Systems

4.9

15.7%

Total

19.4

10.6%

$20 Billion Growth Market

Total Storage Market

End-user Revenue

$ Billions

“Recovery”

Storage Market

End-user Revenue

$ Billions

CAGR% for 2003-2008

Source: Gartner and Quantum

Target Market Represents Growth Opportunity that is 2x

the Rate of Storage Industry Overall

not necessarily represent the company's outlook and is for planning purposes only.

Stronger Platform for Growth

Our Vision: Comprehensive and integrated solutions for

securely storing, managing, protecting and recovering data in

open systems IT environments

Core

Backup &

Recovery

Remote

Site

Disaster

Recovery

Workflow

Archiving

Storage

Security

Tiered

Data

Center

Storage

Data

Mgmt.

FastStor

Scalar i500

PX500 Series

Scalar 10k

SuperLoader 3

iSurety

Guardian

Global Services

Pathlight VX

DX-Series

PX720

Scalar i2000

DPM5500

not necessarily represent the company's outlook and is for planning purposes only.

Midrange Segment

5,000

10,000

15,000

20,000

25,000

101-1,000+

31 to 100

21 to 30

1 to 20

ADIC

Quantum

Source:IDC, "Quantum Determined to Ignite Its Tape Business:

Acquires ADIC," May 2006, doc #201541

Quantum and ADIC Midrange Tape Automation Shipments by Library Size, 2005

not necessarily represent the company's outlook and is for planning purposes only.

IPO

Acquires Hard Disk

and Tape Drive

businesses from

Digital Equipment

Corporation

Quantum splits its

existing common stock

into tracking stocks for

each of its two divisions

IntelliQuest

survey

shows Quantum

holding a 63%

market share for data

backup and

archiving

Company Founded

Primarily

manufactures

Hard Disk Drive

Systems

Sells HDD Division to

Maxtor –

Shifts focus

exclusively to tape drives

and removable storage

Ships its 100 millionth

DLTtape

Media

Cartridge

September 1, 2006:

Expected close of the

acquisition of ADIC

History of Successful Acquisitions

not necessarily represent the company's outlook and is for planning purposes only.

Integration is Critical

•

Dedicated experienced integration leader

•

Cost synergies are well concentrated

–

R&D

–

G&A

–

Services

–

Operations

•

Sales

and

marketing

largely

complementary

–

minimal

disruption

•

Additional sales opportunities

–

Tape drive and media

•

Customer and partner feedback has been positive

•

Integration plan is underway

not necessarily represent the company's outlook and is for planning purposes only.

80% of Synergies are Concentrated in Four

Areas

Manufacturing OH & BOM

•

Service infrastructure

utilization improvement

•

Higher manufacturing

utilization

•

Supply chain management

•

CM consolidation

•

BOM reduction

Sales & Marketing

•

HC reductions for

duplicative functions

•

Marketing/tradeshow

programs consolidation

•

Administrative redundancies

G&A

•

HC reductions for

duplicative functions

(HR/Facilities/Admin/Exec)

•

Audit/legal/IR fees reduced

•

BOD & R/E elimination

•

IT redundancies

R&D

•

HC reductions

•

Shared R&D costs

not necessarily represent the company's outlook and is for planning purposes only.

Integration Philosophy

•

Pick the best

–

Management

–

Products

–

Operations

•

Make

decisions

soon

after

all

critical

areas,

including

synergy actions

•

Blend sales force and capabilities: High volume (Quantum) and

High touch (ADIC)

•

Aggressive communications to relevant constituents to ensure

smooth

integration: customers, employees, partners

•

De-leverage quickly and prudently

not necessarily represent the company's outlook and is for planning purposes only.

Summary

•

Coming together to become the largest independent provider of backup,

recovery and archive solutions

–

Address customers evolving data protection, retention and recovery needs

•

Most comprehensive and integrated range of solutions

–

Unparalleled portfolio of systems, software, devices, media and service capabilities

•

Benefits of scale and integration, and a single source of intelligent and

innovative products and services

–

Deliver unsurpassed value to customers and partners

–

Financially positioned to invest in new solutions to address emerging storage

challenges

•

Much stronger go-to-market infrastructure

–

Larger and better leveraged sales and service capabilities

–

Enhanced support for channel partners, OEMs and end-users

•

Broader base of R&D expertise provides opportunities for greater

innovation

not necessarily represent the company's outlook and is for planning purposes only.

Additional Information and Where to Find It

Quantum plans to file with the SEC a Registration Statement on Form S 4 in

connection with the transaction, and ADIC plans to file with the

SEC and mail to

its stockholders a Proxy Statement/Prospectus in connection with

the

transaction. The Registration Statement and the Proxy Statement/Prospectus

will contain important information about Quantum, ADIC, the transaction and

related matters. Investors and stockholders are urged to read the Registration

Statement and the Proxy Statement/Prospectus carefully when they

are

available. Investors and stockholders will be able to obtain free copies of the

Registration Statement and the Proxy Statement/Prospectus and other

documents filed with the SEC by Quantum and ADIC through the web

site

maintained by the SEC at www.sec.gov. In addition, investors and stockholders

will be able to obtain free copies of the Registration Statement

and the Proxy

Statement/Prospectus from Quantum by contacting Investor Relations at (408)

944-4450 or IR@quantum.com, or from ADIC by contacting Stacie Timmermans

at (425) 881-8004 or stacie.timmermans@adic.com.

Quantum and its directors and executive officers may be deemed to be

participants in the solicitation of proxies from the stockholders of ADIC in

connection with the transaction described herein. Information regarding the

special interests of these directors and executive officers in the transaction

described herein will be included in the Proxy Statement/Prospectus described

above.

not necessarily represent the company's outlook and is for planning purposes only.

Forward-Looking Statements

This presentation contains forward-looking statements within the meaning of the federal

securities laws including, without limitation, statements regarding the following: the merger

transaction and the benefits and synergies of the merger; expectation that target market

represents growth opportunity compared to growth of storage industry; expected benefits

of increased financial strength; and the revenues, partners, markets, customers, products

and technologies of the combined company. These forward-looking statements are

subject to risks and uncertainties as well as assumptions that could cause the actual

results of Quantum to differ materially from those expressed or implied by such forward-

looking statements.

Such risks and uncertainties include, among others, the following: the approval of the

transaction by the stockholders of ADIC; the satisfaction of closing conditions to the

transaction, including the receipt of regulatory approvals; the successful and timely

integration of ADIC operations, technologies and employees with those of Quantum; the

ability to realize the anticipated benefits or synergies of the transaction in a timely manner

or at all; fluctuations in the demand for the products of the combined company; possible

development

marketing

delays

relating

product

offerings

the

combined

company;

the

introduction

new

products

technologies

competitors;

and

the

ability

the

combined company to achieve expected operating and financial results. A detailed

discussion of other risks and uncertainties that could cause actual results or events to

differ materially from such forward-looking statements is included in Quantum’s and

ADIC’s

most recent filings with the Securities and Exchange Commission. Quantum and

ADIC undertake no obligation and do not intend to update these forward-looking

statements to reflect events or circumstances occurring after this presentation.

not necessarily represent the company's outlook and is for planning purposes only.

Appendix

not necessarily represent the company's outlook and is for planning purposes only.

Quantum Product Portfolio

DX100

DX30

CDL Autoloader

SuperLoader™

PX502

PX506

PX510

PX720

LTO FH

DLT-S

LTO HH

DLT-V

DDS/DAT

Travan

DISK-BASED BACKUP SYSTEMS

TAPE DRIVES AND MEDIA

DX5000

DPM5500

DX3000

TAPE AUTOMATION SYSTEMS

DPM5500

GoVault

not necessarily represent the company's outlook and is for planning purposes only.

ADIC Information

•

ADIC is a publicly traded, NASDAQ listed (ADIC) company headquartered in Redmond, WA

–

LTM Revenue, EBITDA and market Cap of $462m, $39.5m and $511m (5/2/06)

respectively

•

ADIC is the world’s leading supplier of automated tape systems, customers include:

–

Technology: Cray, Dell, Fujitsu Siemens, HP, IBM, Microsoft, SAP, Siemens, Sony, Sun

Microsystems, Yahoo!

–

Financial/ Services: Abbey, Bank of China, CIT Group, Clifford Chance, Deutsche Bank,

Ernst & Young, Fidelity Investments, JP Morgan Chase

–

Commercial/Industrial: BP, ChevronTexaco, Corporate Express, Ford, Harley Davidson,

Johnson & Johnson, Shell

–

Telecommunications/Entertainment: BT, Deutsche Telecom, Disney, MCI, Nokia, Sprint

PCS, T-Mobile, Time Warner, Turner Broadcasting, Verizon

•

Uses a worldwide sales force, a global reseller network and OEMs. Products are sold under the

ADIC brand name and under the names of various OEM customers including Apple, Cray, Dell,

EMC, Fujitsu-Siemens, HP, IBM, and Sun/StorageTek. OEM customers accounted for 39% of

FY05 sales

•

As of October 31, 2005, ADIC had 1,109 full-time employees, including 275 in sales and marketing,

211 in engineering and research and development, 308 in global services, 200 in manufacturing

and operations and 115 in finance, general administration and management

not necessarily represent the company's outlook and is for planning purposes only.

ADIC Market Approach

•

ADIC is moving beyond simple hardware to focus on Intelligent Storage™

–

Hardware devices with a significant software component

–

This

makes

ADIC’s

devices

easier

manage,

easier

integrate

into

complex,

multi-protocol

networking

environment,

and

reliable

for

large-scale

data

storage in an enterprise environment

–

Archiving

and

data

management

software,

Storage

Area

Network

(SAN)

management

solutions,

tape

libraries

with

built-in

controllers,

remote

monitoring,

diagnostics, and repair, and comprehensive, full-solution backup systems

•

The

“Intelligent”

approach

allows

for

faster

backup

shorter

backup

windows,

reliable

data

transfer,

better

compression

performance,

easier

service

and

diagnostics,

superior

scalability,

and

options

for

customized

management

departments and storage administrators

•

This high-end model is expected to drive growth in the segment going forward

not necessarily represent the company's outlook and is for planning purposes only.

ADIC Entry-Level Products

•

ADIC offers an entry-level autoloader and an entry-level tape library, slotting above

Quantum’s single tape drives

–

FastStor

1 and 2 (based on height) offer 8-tape capacity with a single drive

–

Offers a weeks worth of reliable, unattended backup

–

FastStor

1 is the industry’s smallest LTO autoloader at only 1.75 vertical inches (1U)

–

The Scalar24 offers native capacity up to 9.6TB with 2 drives and 24 storage slots

–

Offers LTO or SDLT media, iSCSI

and Fibre

Channel (FC) connectivity

–

A robust library at an affordable price

not necessarily represent the company's outlook and is for planning purposes only.

ADIC Tape Libraries

•

ADIC’s

strongest product suite is its extensive selection of mid-range and high-end tape libraries

–

The

Scalar

i500,

introduced

the

end

2005

and

boasting

323TB

storage,

has

become the fastest ADIC Library to reach 2,000 units sold, in only five months

–

Innovative

solutions,

including

iPlatform

architecture

and

iLayer

server

management,

help

reduce service calls by 50% and issue resolution time by 30%

–

Libraries

have

“Capacity-On-Demand”,

with

the

Scalar

i2000

enterprise-class

device

expandable from 100 slots to nearly 3,500, with 2,800TB of maximum storage

–

The

Scalar

10K

the

first

Storage

Area

Network

(SAN)

enabled

library

for

consolidated

enterprise backup and archiving

–

Boasts up to 324 drives and 13,884 cartridges with 11,107 TB of maximum capacity

not necessarily represent the company's outlook and is for planning purposes only.

ADIC Disk-Based Backup

•

From

its

acquisition

PathLight

Technology,

ADIC

offers

mid-range

and

enterprise-class

disk

backup system

–

Disk-based

replication

offers

secure,

rapid,

and

reliable

form

backup,

adding

additional

redundancy to storage

–

Difficult-to-backup

data,

and

critical

data

backed

disk,

then

automatically

transferred to tape

•

The disk writes quicker and the data is maintained with more certainty

ADIC’s

Pathlight

650

delivers

premium

protection

for

your

organization’s

most

difficult-to-

backup

data.

this

example,

and

database

information

backed

disk,

while

tapes

are

created

automatically

one

library

partition

for

disaster

recovery

and

retention.

File

and

server

data

backed

directly

tape

using

separate

partition in the same library.

not necessarily represent the company's outlook and is for planning purposes only.

ADIC SAN Appliances

•

SAN

Devices

work

hardware

front

for

storage

network,

linking

dissimilar

operating

systems and protocols work together in a unified network

–

Dynamically maps diskless servers to disk volumes and providing access security

–

architects

use

the

SNC

5000

combine

heterogeneous

devices

into

single,

centrally

managed

environment

order

obtain

the

highest

possible

value

and

utility

from

their

data center resources

Test

results

demonstrate

significant

write

performance

increases

for

library

configurations

that

connect

tape

drives

switched

fabric

through

ADIC®

Storage

Networking

Library

controller

comparison

similar

drives

connected

directly

the

fabric.

Typical

enterprise-scale

configurations

show

19%

throughput improvement

for controller-connected units.

not necessarily represent the company's outlook and is for planning purposes only.

ADIC Software Solutions

•

Data Management Software

–

StorNext

helps

customers

store

data

lower

overall

cost

and

access

that

data

faster

through

workflow management and intelligent archiving

–

Creates

shared

pools

digital

assets,

including

media

content

and

analytical

data,

that

critical

files can be processed faster

–

also

consolidates

data

Xserve

RAID

systems,

and

provides

common

interface

Windows,

Linux, UNIX, and Apple Xsan

systems to move data more easily

Xsan

and

StorNext

clients

deliver

shared

storage

access

down

the

file

level

for

multiple

hosts,

eliminating

the

need

for

storage

provisioning.

StorNext

provides

high

speed,

shared

workflow

and

high

capacity,

multi-tier