QUANTUM CORP /DE/ — Director's Dealing 2010

Nov 3, 2010

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: QUANTUM CORP /DE/ (QTM)
CIK: 0000709283
Period of Report: 2010-11-01

Reporting Person: WOLF DENNIS P (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2010-11-01	Common Stock	M	33000	$1.77	Acquired	121776	Direct
2010-11-01	Common Stock	M	66000	$1.16	Acquired	187776	Direct
2010-11-01	Common Stock	S	99000	$3.255	Disposed	88776	Direct
2010-11-01	Common Stock	M	45000	$2.83	Acquired	133776	Direct
2010-11-01	Common Stock	S	45000	$3.35	Disposed	88776	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2010-11-01	Non-Qualified Stock Options	$1.77	M	33000	Disposed	2015-09-01	Common Stock (33000)	Direct
2010-11-01	Non-Qualified Stock Options	$1.16	M	66000	Disposed	2016-09-01	Common Stock (66000)	Direct
2010-11-01	Non-Qualified Stock Options	$2.83	M	45000	Disposed	2014-07-31	Common Stock (45000)	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 May 28, 2010.

F3: The sale price reported in column 4 of Table I represents the weighted average sale price of the shares sold ranging from $3.23 to $3.26 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.

F4: These options were granted on September 1, 2008.

F5: These options were granted on September 1, 2009.

F6: The options are fully vested and immediately exercisable.

F7: These options were granted on July 31, 2007.