QUANTUM CORP /DE/ — Director's Dealing 2011

Apr 7, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: QUANTUM CORP /DE/ (QTM)
CIK: 0000709283
Period of Report: 2011-04-06

Reporting Person: ESBER EDWARD M (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-04-06	Common Stock	M	33000	$1.77	Acquired	125135	Direct
2011-04-06	Common Stock	M	66000	$1.16	Acquired	191135	Direct
2011-04-06	Common Stock	M	18750	$2.08	Acquired	209885	Direct
2011-04-06	Common Stock	M	18750	$2.33	Acquired	228635	Direct
2011-04-06	Common Stock	S	136500	$2.80	Disposed	92135	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2011-04-06	Non-Qualified Stock Options	$1.77	M	33000	Disposed	2015-09-01	Common Stock (33000)	Direct
2011-04-06	Non-Qualified Stock Options	$1.16	M	66000	Disposed	2016-09-01	Common Stock (66000)	Direct
2011-04-06	Non-Qualified Stock Options	$2.08	M	18750	Disposed	2012-07-31	Common Stock (18750)	Direct
2011-04-06	Non-Qualified Stock Options	$2.33	M	18750	Disposed	2012-09-02	Common Stock (18750)	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, as amended on February 8, 2011.

F3: The options are fully vested and immediately exercisable.