Amendment Fifteen To the Product Purchase Agreement No. 02542-60507

This Fifteenth Amendment (“Amendment Fifteen”) amends that certain Product Purchase Agreement No. 02542-60507, including all exhibits and executed Amendments One through Fourteen (the “Agreement”) dated September 9, 2007, by and between Dot Hill Systems Corp (“Supplier”) a corporation organized and operating under the laws of Delaware with its principal place of business at 1351 S. Sunset Street, Longmont, Colorado 80501 and Hewlett-Packard Company (“HP”), a Delaware corporation, with offices at 3000 Hanover Street, Palo Alto, California 94304. Supplier and HP may be referred to individually as “Party” and collectively as “Parties”.

WHEREAS, HP and Supplier have previously entered into the Agreement stated above;

WHEREAS, the purpose of this Amendment Fifteen is to set forth new pricing for certain Products sold by Supplier and purchased by HP pursuant to the Agreement;

WHEREAS, HP and Supplier desire to amend the Agreement as herein provided;

NOW, THEREFORE, for good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, HP and Supplier hereby agree as follows:

Except as expressly set forth in this Amendment Fifteen, the Agreement remains in effect and is unchanged.

IN WITNESS WHEREOF, the Parties, intending to be legally bound hereby, have executed this Amendment Fifteen as of the Amendment Fifteen Effective Date.

The parties agree to further amend this Exhibit for existing and/or follow on products as needed and as mutually agreed upon. As SOW’s are finalized and signed by both parties, they will be added to this Exhibit.

Detailed listings of Products with Product Numbers are set forth in the various pricing tables published by Supplier on a regular basis which are automatically incorporated into Exhibit E of the Agreement.

This Exhibit in no way alters or nullifies any previous Amendments to the Agreement. The failure to list a SOW on this Exhibit, or anywhere else in the Agreement, does not in any way change the fact that all purchases by HP and its Eligible Purchasers from Supplier shall be governed by the terms of this Agreement, whether or not set forth in an Exhibit to this Agreement, provided that the SOW has been signed by both parties.