SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 4)* Dot Hill Systems Corp. ---------------------- (Name of Issuer) Common Stock, $.001 par value ----------------------------- (Title of Class of Securities) 25848T109 -------------- (CUSIP Number) December 31, 2002 ----------------- Date of Event Which Requires Filing of this Statement Check the appropriate box to designate the rule pursuant to which this Schedule is Filed: [ ] Rule 13d-1(b) [ ] Rule 13d-1(c) [X] Rule 13d-1(d) ----------------------- * The remainder of this cover page shall be filled out for a reporting person's initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter disclosures provided in a prior cover page. The information required on the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act. CUSIP No. 25848T109 Page 2 of 5 Pages -------------------------------------------------------------------------------- 1) Name of Reporting Person Benjamin Monderer I.R.S. Identification No. of Above Person (Entities Only) -------------------------------------------------------------------------------- 2) Check the Appropriate Box (a) [ ] if a Member of a Group (b) [ ] -------------------------------------------------------------------------------- 3) SEC Use Only -------------------------------------------------------------------------------- 4) Citizenship or Place United States of Organization -------------------------------------------------------------------------------- Number of 5) Sole Voting 3,157,056 shares Shares Beneficially Power of Common Stock Owned by Each Reporting Person -------------------------------------------- With 6) Shared Voting 100 shares of Power Common Stock -------------------------------------------- 7) Sole Disposi- 3,157,056 shares tive Power of Common Stock -------------------------------------------- 8) Shared Dis- 100 shares of positive Power Common Stock -------------------------------------------- 9) Aggregate Amount Beneficially 3,157,156 shares Owned by Each Reporting person of Common Stock (1) -------------------------------------------------------------------------------- 10) Check if the Aggregate Excludes 1,560,350 shares Amount in Row (9) owned by spouse Excludes Certain Shares -------------------------------------------------------------------------------- 11) Percent of Class Represented by 12.5% Amount in Row (9) -------------------------------------------------------------------------------- 12) Type of Reporting Person IN CUSIP No. 25848T109 Page 3 of 5 Pages -------------------------------------------------------------------------------- 1) Name of Reporting Person Carol Turchin I.R.S. Identification No. of Above Person (Entities Only) -------------------------------------------------------------------------------- 2) Check the Appropriate Box (a) [ ] if a Member of a Group (b) [ ] -------------------------------------------------------------------------------- 3) SEC Use Only -------------------------------------------------------------------------------- 4) Citizenship or Place United States of Organization -------------------------------------------------------------------------------- Number of 5) Sole Voting 1,560,350 shares Shares Beneficially Power of Common Stock Owned by Each Reporting Person -------------------------------------------- With 6) Shared Voting 100 shares of Power Common Stock -------------------------------------------- 7) Sole Disposi- 1,560,350 shares tive Power of Common Stock -------------------------------------------- 8) Shared Dis- 100 shares of positive Power Common Stock -------------------------------------------- 9) Aggregate Amount Beneficially 1,560,450 shares Owned by Each Reporting person of Common Stock -------------------------------------------------------------------------------- 10) Check if the Aggregate Excludes 3,157,056 Amount in Row (9) shares beneficially Excludes Certain Shares owned by spouse -------------------------------------------------------------------------------- 11) Percent of Class Represented by 6.2% Amount in Row (9) -------------------------------------------------------------------------------- 12) Type of Reporting Person IN CUSIP No. 25848T109 Page 4 of 5 Pages Amendment No. 4 to Schedule 13G ------------------------------- Reference is hereby made to the statement on Schedule 13G originally filed with the Securities and Exchange Commission on March 17, 1999, Amendment No. 1 thereto filed on February 14, 2000, Amendment No. 2 thereto filed on February 14, 2001 and Amendment No. 3 thereto filed on February 12, 2002 (as so amended, the "Schedule 13G"). Terms defined in the Schedule 13G are used herein as so defined. The following items of the Schedule 13G are hereby amended and restated as follows: ITEM 4. OWNERSHIP. (a) Amount Beneficially Owned: 4,717,506 shares of Common Stock (b) Percent of Class: 18.7% (c) Number of shares as to which such person has: (i) sole power to vote or to direct the vote: Benjamin Monderer: 3,157,056(1) Carol Turchin: 1,560,350 (ii) shared power to vote or to direct the vote: Benjamin Monderer: 100(2) Carol Turchin: 100(2) (iii) sole power to dispose or to direct the disposition of: Benjamin Monderer: 3,157,056(1) Carol Turchin: 1,560,350 (iv) shared power to dispose or to direct the disposition of: Benjamin Monderer: 100(2) Carol Turchin: 100(2) (1) Includes 2,240,753 shares held by Dr. Monderer and 916,303 shares held by the Monderer 1999 GRAT u/A/d 1999 Trust, as to which Dr. Monderer is the trustee. (2) Includes 100 shares held by Dr. Monderer and Carol Turchin as joint tenants. CUSIP No. 25848T109 Page 5 of 5 Pages SIGNATURE After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct. Date: March 7, 2003 /s/ Benjamin Monderer ----------------------------- Name: Benjamin Monderer Date: March 7, 2003 /s/ Carol Turchin ----------------------------- Name: Carol Turchin