Exhibit 99.1

News Release

Quantum Corporation Reports Fiscal Fourth Quarter and
Full Year 2015 Results

SAN JOSE, Calif., – May 6, 2015 – Quantum Corp. (NYSE:QTM) today reported results for the fiscal fourth quarter and full year 2015 ended March 31, 2015.

Fiscal Fourth Quarter 2015 Results

(All comparisons are relative to the fiscal fourth quarter of 2014.)

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Fiscal 2015 Results

(All comparisons are relative to fiscal 2014, which included a one-time $15 million royalty payment to Quantum.)

“Our fourth quarter capped off a year that was a key turning point for Quantum as we generated strong revenue and profit results that reflect the strategic actions we’ve taken over the last several years to improve our financial and operational performance, deliver even greater value to customers and position the company for the future,” said Linda Breard, CFO. “Branded revenue grew year-over-year in all four quarters, driven by growth rates in scale-out storage increasing each quarter – ultimately to 116 percent in Q4. We also returned to generating annual growth in DXi revenue, and our full year GAAP net income was the highest it’s been in more than five years.”

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“We are well-positioned to build on this momentum and drive increased growth and profit in fiscal 2016,” said Jon Gacek, president and CEO. “Our scale-out storage solutions offer a unique combination of industry-leading performance and low-cost retention through multi-tier storage – across sites and the cloud – all managed by our StorNext^® platform. This makes them ideal for addressing increased demands for re-monetizing and analyzing digital content. As a result, we plan to expand our leadership in media and entertainment and also extend our expertise to other markets such as video surveillance, corporate video and high performance computing applications.

“At the same time, we will leverage our long-standing leadership in data protection technology, recently expanded archive offerings and incorporation of Dot Hill disk arrays into our product line to provide our large install base of users and future customers with an even broader range of data center solutions.

“Finally, we will continue to invest in delivering further differentiated solutions, capitalizing on new opportunities through sales and marketing initiatives and driving long-term growth.”

Fiscal 2016 Outlook

For the fiscal first quarter, Quantum expects:

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For the full fiscal 2016 year, Quantum is targeting year-over-year growth of:

Changes in Board of Directors

In a separate news release issued today, Quantum announced the resignation of Jeffrey Smith from its board of directors and appointment of Robert Andersen (see news release at www.quantum.com/BODchanges).

Fiscal Fourth Quarter 2015 Business Highlights

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Conference Call and Audio Webcast Notification

Quantum will issue a news release on its fourth quarter and full year 2015 financial results on Wednesday, May 6, 2015, after the close of the market. The company will also hold a conference call and live audio webcast to discuss these results that same day at 2:00 p.m. PDT. Press and industry analysts are invited to attend in listen-only mode.

Dial-in number: 719-457-2645 (U.S. and International); Access Code 6066999
Replay number: 719-457-0820 (U.S. and International); Access Code 6066999
Replay expiration: Monday, May 11, 2015, at 5:00 p.m. PDT
Webcast site: www.quantum.com/investors

About Quantum

Quantum is a leading expert in scale-out storage, archive and data protection, providing solutions for capturing, sharing and preserving digital assets over the entire data lifecycle. From small businesses to major enterprises, more than 100,000 customers have trusted Quantum to address their most demanding data workflow challenges. With Quantum, customers can Be Certain™ they have the end-to-end storage foundation to maximize the value of their data by making it accessible whenever and wherever needed, retaining it indefinitely and reducing total cost and complexity. See how at www.quantum.com/customerstories.

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Quantum, the Quantum logo, Be Certain, DXi, StorNext, StorNext Pro, Q-Cloud and Quantum Advantage Program are either registered trademarks or trademarks of Quantum Corporation and its affiliates in the United States and/or other countries. All other trademarks are the property of their respective owners.

“Safe Harbor” Statement under the U.S. Private Securities Litigation Reform Act of 1995: This press release contains “forward-looking” statements within the meaning of the Private Securities Litigation Reform Act of 1995. Specifically, without limitation, our statements that we are well-positioned to build on our momentum and drive increased growth and profit in fiscal 2016, that we plan to expand our leadership in media and entertainment and also extend our expertise to other markets such as video surveillance, corporate video and high performance computing applications, that we will leverage our long-standing leadership in data protection technology, that we will continue to invest in delivering further differentiated solutions, capitalizing on new opportunities through sales and marketing initiatives and driving long-term growth and all of our statements under the section titled “Fiscal 2016 Outlook” are forward-looking statements within the meaning of the Safe Harbor. All forward-looking statements in this press release are based on information available to Quantum on the date hereof. These statements involve known and unknown risks, uncertainties and other factors that may cause Quantum’s actual results to differ materially from those implied by the forward-looking statement. More detailed information about these risk factors, and additional risk factors are set forth in Quantum’s periodic filings with the Securities and Exchange Commission, including, but not limited to, those risks and uncertainties listed in the section entitled “Risk Factors” in Quantum’s Annual Report on Form 10-K filed with the Securities and Exchange Commission on June 6, 2014 and in Quantum’s Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on February 6, 2015. Quantum expressly disclaims any obligation to update or alter its forward-looking statements, whether as a result of new information, future events or otherwise.

Use of Non-GAAP Financial Measures

Quantum believes that the non-GAAP financial measures disclosed above provide useful and supplemental information to investors regarding its quarterly financial performance. Quantum management uses these non-GAAP financial measures internally to understand, manage and evaluate the company’s business results and make operating decisions. For instance, Quantum management often makes decisions regarding staffing, future management priorities and how the company will direct future operating expenses on the basis of non-GAAP financial measures. In addition, compensation of our employees is based in part on the performance of our business based on non-GAAP operating income.

The non-GAAP financial measures used in this press release exclude the impact of the items below for the following reasons:

Amortization of Intangible Assets
This includes acquired intangibles such as purchased technology and customer relationships in connection with prior acquisitions. These expenses are not factored into management’s evaluation of potential acquisitions or Quantum’s performance after completion of the acquisitions because they are not related to Quantum’s core operating performance. In addition, the frequency and amount of such charges can vary significantly based on the size and timing of acquisitions and the maturities of the businesses being acquired. Excluding acquisition-related charges from non-GAAP measures provides investors with a basis to compare Quantum against the performance of other companies without the variability caused by purchase accounting.

Share-Based Compensation Expense
Share-based compensation expense relates primarily to equity awards such as stock options and restricted stock units. Share-based compensation is a non-cash expense that varies in amount from period to period and is dependent on market forces that are often beyond Quantum’s control. As a result, management excludes this item from Quantum’s internal operating forecasts and models. Management believes that non-GAAP measures adjusted for share-based compensation provide investors with a basis to measure Quantum’s core performance against the performance of other companies without the variability created by share-based compensation as a result of the variety of equity awards used by other companies and the varying valuation methodologies and assumptions used.

Restructuring Charges
Restructuring charges primarily relate to expenses associated with changes to Quantum’s operating structure. Restructuring charges are excluded from non-GAAP financial measures because they are not considered core operating activities. Although Quantum has engaged in various restructuring activities in the past, each has been a discrete event based on a unique set of business objectives. Management believes that it is appropriate to exclude restructuring charges from Quantum’s non-GAAP financial measures, as it enhances the ability of investors to compare Quantum’s period-over-period operating results from continuing operations.

Outsourcing Transition Costs
Outsourcing transition costs are expenses attributable to transitioning our manufacturing to an outsourced model. These costs are excluded from non-GAAP financial measures because they are not considered core operating activities and management believes that it is appropriate to exclude these costs in order to provide investors the ability to compare Quantum’s period-over-period operating results from continuing operations.

Proxy Contest and Related Costs
Proxy contest and related costs are expenses incurred to respond to activities and inquiries of Starboard Value LP, including their proxy solicitation. The Company has not incurred significant expenses in connection with such matters in historical periods and these costs are not considered core operating activities. Management believes that it is appropriate to exclude these costs in order to provide investors the ability to compare Quantum’s period-over-period operating results from continuing operations.

Crossroads Patent Litigation Costs
Crossroads patent litigation costs are expenses incurred to defend ourselves and perform other activities related to a patent infringement lawsuit filed by Crossroads Systems, Inc. These costs are excluded from non-GAAP financial measures because they are not considered core operating activities, and management believes that it is appropriate to exclude these costs in order to provide investors the ability to compare Quantum’s period-over-period operating results from continuing operations.

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Acquisition Expenses
The acquisition expenses were those expenses incurred to acquire Symform, Inc. (“Symform”) and are not part of Quantum’s future core operations.

Symform Expenses, Net
Quantum acquired a cloud storage services platform from Symform in July 2014. Symform revenue comprises revenue generated from the Symform cloud storage services platform. Symform expenses consist of costs related to running, maintaining and further developing the Symform cloud storage services platform as well as the costs of integrating Symform into Quantum’s business. Net Symform expenses represent Symform expenses less Symform revenue, and non-GAAP gross margin excludes both Symform revenue and cost of revenue. Management believes that it is appropriate to exclude these amounts in order to provide investors with a view of Quantum’s results consistent with how management views and is running the business.

Loss on Debt Extinguishment
The loss on debt extinguishment relates to a specific debt repurchase action undertaken in January 2015. The loss is excluded from non-GAAP financial measures because it is not considered a core operating activity and management believes that it is appropriate to exclude the loss in order to provide investors the ability to compare Quantum’s period-over-period results from continuing operations.

Non-GAAP financial measures should not be considered as a substitute for, or superior to, measures of financial performance prepared in accordance with GAAP. They are limited in value because they exclude charges that have a material impact on the company’s reported financial results and, therefore, should not be relied upon as the sole financial measures to evaluate the company. The non-GAAP financial measures are meant to supplement, and be viewed in conjunction with, GAAP financial measures. Investors are encouraged to review the reconciliation of the non-GAAP financial measures to their most directly comparable GAAP financial measures as provided in the tables accompanying this press release.

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QUANTUM CORPORATION
CONDENSED CONSOLIDATED BALANCE SHEETS
(In thousands)
(Unaudited)

* Derived from the March 31, 2014 audited Consolidated Financial Statements.

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QUANTUM CORPORATION
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
(In thousands, except per share amounts)
(Unaudited)

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QUANTUM CORPORATION
CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
(In thousands)
(Unaudited)

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QUANTUM CORPORATION
GAAP TO NON-GAAP RECONCILIATION
(In thousands, except per share amounts)
(Unaudited)

The non-GAAP financial information set forth in this table is not prepared in accordance with generally accepted accounting principles and may be different from non-GAAP financial information used by other companies.

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QUANTUM CORPORATION
GAAP TO NON-GAAP RECONCILIATION
(In thousands, except per share amounts)
(Unaudited)

The non-GAAP financial information set forth in this table is not prepared in accordance with generally accepted accounting principles and may be different from non-GAAP financial information used by other companies.

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QUANTUM CORPORATION
FORECAST FIRST QUARTER FISCAL 2016
GAAP TO NON-GAAP RECONCILIATION
(Dollars in millions)

Estimates based on current (May 6, 2015) projections.

The projected GAAP and non-GAAP financial information set forth in this table represent forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. For risk factors that could impact these projections, see our Annual Report on Form 10-K as filed with the SEC on June 6, 2014. We disclaim any obligation to update information in any forward-looking statement.

The non-GAAP financial information set forth in this table is not prepared in accordance with generally accepted accounting principles and may be different from non-GAAP financial information used by other companies.

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