QUANTUM CORP /DE/ — Director's Dealing 2011

Jul 5, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: QUANTUM CORP /DE/ (QTM)
CIK: 0000709283
Period of Report: 2011-07-01

Reporting Person: BELLUZZO RICHARD (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-07-01	Common Stock	M	30000	$0.98	Acquired	983333	Direct
2011-07-01	Common Stock	S	30000	$3.28	Disposed	953333	Direct
2011-07-01	Common Stock	S	50000	$3.3064	Disposed	903333	Direct
2011-07-01	Common Stock	F	91694	$3.37	Disposed	811639	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2011-07-01	Non-Qualified Stock Options	$0.98	M	30000	Disposed	2016-07-01	Common Stock (30000)	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.

F4: The sale price reported in column 4 of Table I represents the weighted average sale price of the shares sold ranging from $3.25 to $3.32 per share. Upon request by the Commission staff, the Issuer, or a security holder of the Issuer, the reporting person will provide full information regarding the number of shares sold at each separate price.

F5: The sale price reported in column 4 of Table I represents the weighted average sale price of the shares sold ranging from $3.27 to $3.33 per share. Upon request by the Commission staff, the Issuer, or a security holder of the Issuer, the reporting person will provide full information regarding the number of shares sold at each separate price.

F6: Surrender of shares to satisfy tax withholding obligations upon vesting of restricted stock units granted on 7/1/2010.