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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
709283	Quantum Corp	QTM	Computer Storage Devices (3572)	942665054

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1198540	C William Britts	C/O Quantum Corporation 1650 Technology Drive, Suite 800 San Jose CA 95110	Evp, Sales & Marketing	No	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Acquisiton	2010-06-21	2,952	$1.46	638,614	No	4	M	Direct
Common Stock	Disposition	2010-06-21	2,952	$2.50	635,662	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	M	Direct
No	4	S	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Non-Qualified Stock Options	Disposition	2010-06-21	2,952	$0.00	2,952	$1.46

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
39,485	2006-08-22	2010-08-22	No	4	M	Direct

Footnotes

Reflects the exercise of the stock options listed in Table II of this Form 4.
The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on February 26, 2010.
These options were granted under the 1999 Stock Incentive Plan of Advanced Digital Information Corporation ("ADIC") and assumed by Quantum Corporation ("Quantum") on August 22, 2006, pursuant to the Agreement and Plan of Merger between ADIC and Quantum. The options were exchanged for options to purchase Quantum stock, at the exchange ratio of 5.9756 per share.
The options are fully vested and immediately exercisable.