QUANTUM CORP /DE/ — Director's Dealing 2011

May 3, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: QUANTUM CORP /DE/ (QTM)
CIK: 0000709283
Period of Report: 2011-05-02

Reporting Person: BELLUZZO RICHARD (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-05-02	Common Stock	M	8248	$0.98	Acquired	1091035	Direct
2011-05-02	Common Stock	S	58248	$3.25	Disposed	1032787	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2011-05-02	Non-Qualified Stock Options	$0.98	M	8248	Disposed	2016-07-01	Common Stock (8248)	Direct

Footnotes

F1: Reflects the exercise of the stock options listed in Table II of this Form 4.

F2: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on November 24, 2010.

F3: The options are fully vested and immediately exercisable.