UNITED STATES
                     SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C. 20549

                                  FORM 10-K


  (Mark one)

  /X/ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
      EXCHANGE ACT OF 1934
      For the fiscal year ended December 31, 2007

      OR


  / / TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
      EXCHANGE ACT OF 1934
      For the transition period from ____________ to ____________



      Commission file number: 333-131374-38

      Bear Stearns Asset Backed Securities Trust 2007-SD1
      (exact name of issuing entity as specified in its charter)

      Bear Stearns Asset Backed Securities I LLC
      (exact name of the depositor as specified in its charter)

      EMC Mortgage Corporation
      (exact name of the sponsor as specified in its charter)



  New York                                54-2198610
  (State or other jurisdiction of         54-2198611
  incorporation or organization)          54-2198612
                                          54-2198613
                                          (I.R.S. Employer
                                          Identification No.)


   c/o Wells Fargo Bank, N.A.
   9062 Old Annapolis Road
   Columbia, MD                                 21045
  (Address of principal executive               (Zip Code)
  offices)


 Telephone number, including area code: (410) 884-2000




  Securities registered pursuant to Section 12(b) of the Act:

    NONE.



  Securities registered pursuant to Section 12(g) of the Act:

    NONE.



  Indicate by check mark if the registrant is a well-known seasoned issuer, as
  defined in Rule 405 of the Securities Act.

    Yes ___     No  X



  Indicate by check mark if the registrant is not required to file reports
  pursuant to Section 13 or Section 15(d) of the Act.

    Yes ___     No  X



  Note - Checking the box above will not relieve any registrant required to
  file reports pursuant to Section 13 or 15(d) of the Exchange Act from their
  obligations under those Sections.


  Indicate by check mark whether the registrant (1) has filed all reports
  required to be filed by Section 13 or 15(d) of the Securities Exchange Act
  of 1934 during the preceding 12 months (or for such shorter period that the
  registrant was required to file such reports), and (2) has been subject to
  such filing requirements for the past 90 days.

    Yes  X      No ___



  Indicate by check mark if disclosure of delinquent filers pursuant to Item
  405 of Regulation S-K (Section 229.405 of this chapter) is not contained
  herein, and will not be contained, to the best of registrant's knowledge, in
  definitive proxy or information statements incorporated by reference in Part
  III of this Form 10-K or any amendment to this Form 10-K.

    Not applicable.



  Indicate by check mark whether the registrant is a large accelerated filer,
  an accelerated filer, a non-accelerated filer, or a smaller reporting
  company.  See the definitions of "large accelerated filer", "accelerated
  filer" and "smaller reporting company" in Rule 12b-2 of the Exchange Act.

   Large accelerated filer ___
   Accelerated filer ___
   Non-accelerated filer X (Do not check if a smaller reporting company)
   Smaller reporting company ___

  Indicate by check mark whether the registrant is a shell company (as defined
  in Rule 12b-2 of the Act).

    Yes ___     No  X



  State the aggregate market value of the voting and non-voting common equity
  held by non-affiliates computed by reference to the price at which the
  common equity was last sold, or the average bid and asked price of such
  common equity, as of the last business day of the registrant's most recently
  completed second fiscal quarter.

    Not applicable.



  Indicate by check mark whether the registrant has filed all documents and
  reports required to be filed by Section 12, 13 or 15(d) of the Securities
  Exchange Act of 1934 subsequent to the distribution of securities under a
  plan confirmed by a court.

    Not applicable.



  Indicate the number of shares outstanding of each of the registrant's
  classes of common stock, as of the latest practicable date.

    Not applicable.



  DOCUMENTS INCORPORATED BY REFERENCE

  List hereunder the following documents if incorporated by reference and the
  Part of the Form 10-K (e.g., Part I, Part II, etc.) into which the document
  is incorporated: (1)Any annual report to security holders; (2) Any proxy or
  information statement; and (3)Any prospectus filed pursuant to Rule 424(b)
  or (c) under the Securities Act of 1933. The listed documents should be
  clearly described for identification purposes (e.g., annual report to
  security holders for fiscal year ended December 24, 1980).

  See Item 15 (Part IV).



                                     PART I

  Item 1.      Business.

               Omitted.


  Item 1A.     Risk Factors.

               Omitted.


  Item 1B.     Unresolved Staff Comments.

               None.


  Item 2.      Properties.

               Omitted.


  Item 3.      Legal Proceedings.

               Omitted.


  Item 4.      Submission of Matters to a Vote of Security Holders.

               Omitted.




                                     PART II

  Item 5.      Market for Registrant's Common Equity, Related Stockholder
               Matters and Issuer Purchases of Equity Securities.

               Omitted.


  Item 6.      Selected Financial Data.

               Omitted.


  Item 7.      Management's Discussion and Analysis of Financial Condition and
               Results of Operation.

               Omitted.


  Item 7A.     Quantitative and Qualitative Disclosures About Market Risk.

               Omitted.


  Item 8.      Financial Statements and Supplementary Data.

               Omitted.


  Item 9.      Changes in and Disagreements With Accountants on Accounting and
               Financial Disclosure.

               Omitted.


  Item 9A.     Controls and Procedures.

               Omitted.


  Item 9A(T).  Controls and Procedures.

               Omitted.


  Item 9B.     Other Information.

               None.




                                    PART III

  Item 10.     Directors, Executive Officers and Corporate Governance.

               Omitted.


  Item 11.     Executive Compensation.

               Omitted.


  Item 12.     Security Ownership of Certain Beneficial Owners and Management
               and Related Stockholder Matters.

               Omitted.


  Item 13.     Certain Relationships and Related Transactions, and Director
               Independence.

               Omitted.


  Item 14.     Principal Accounting Fees and Services.

               Omitted.




  ADDITIONAL DISCLOSURE ITEMS FOR REGULATION AB


Item 1112(b) of Regulation AB, Significant Obligor Financial Information.

No single obligor represents 10% or more of the pool assets held by the issuing
entity.



Item 1114(b)(2) of Regulation AB, Significant Enhancement  Provider Financial
Information.

No entity or group of affiliated entities provides any external credit
enhancement or other support for the certificates within this transaction as
described under Item 1114 (a) of Regulation AB.



Item 1115(b) of Regulation AB, Certain Derivatives Instruments (Financial
Information).

No entity or group of affiliated entities provides any derivative instruments
or other support for the certificates within this transaction as described
under Item 1115 of Regulation AB.



Item 1117 of Regulation AB, Legal Proceedings.

The following updates disclosure which originally provided in connection with
the Form 424B5 filed on 1/19/2007 and 1/31/2007 by the trust, SEC Accession No.
0000911420-07-000053 and 0000911420-07-000072.

The sponsor has received a civil investigative demand (CID), from the Federal
Trade Commission (FTC), seeking documents and data relating to the sponsor's
business and servicing practices. The CID was issued pursuant to a December 8,
2005 resolution of the FTC authorizing non-public investigations of various
unnamed subprime lenders, loan servicers and loan brokers to determine whether
there have been violations of certain consumer protections laws. The sponsor is
cooperating with the FTC's inquiry.

On March 10, 2008, EMC received notice from the Staff of the FTC that the Staff
believed EMC and its parent, The Bear Stearns Companies, Inc. had violated a
number of Federal consumer protection statutes in connection with its servicing
activities.  With the notice, the Staff delivered a draft complaint and draft
consent order seeking certain injunctive relief regarding business practices and
unspecified monetary redress.  The Staff also indicated that it had been
authorized to offer an opportunity to resolve the matter though consent
negotiations before it seeks approval from the FTC to proceed with the filing of
a complaint.  EMC expects to engage in such discussions with the Staff.



RODRIGUEZ v. EMC Mortgage Corporation and The Bear Stearns Companies

This purported class action is pending in U. S. District Court for the District
of Connecticut. The case was filed in December 2007. It seeks certification
of a class made up of African-American and Hispanic borrowers who had a
non-prime loan serviced by EMC and who were subjected to allegedly improper
servicing practices, including imposition of unwarranted fees, pyramiding of
late fees, unjustified forced-placing of insurance, failure to properly apply
payments, improper reporting of derogatory credit information, and failure to
properly administer escrow accounts. EMC and Bear Stearns have filed motions
to dismiss and to strike.



Item 1119 of Regulation AB, Affiliations and Certain Relationships and Related
Transactions.

The information regarding this Item has been previously filed in a 424(b)(5)
filing dated January 19, 2007.



Item 1122 of Regulation AB, Compliance with Applicable Servicing Criteria.

The reports on assessment of compliance with the servicing criteria for
asset-backed securities and the related attestation reports on such assessments
of compliance are attached hereto under Item 15.

Assurant, Inc. disclosed the following material noncompliance with the servicing
criteria set forth in Item 1122(d)(4)(xii) of Regulation AB applicable to the
Company during the year ended December 31, 2007. As required by Item
1122(d)(4)(xii) of Regulation AB, any late payment penalties in connection with
any payment to be made on behalf of an obligor are paid from the servicer's
funds are not charged to the obligor, unless the late payment was due to the
obligor's error or omission. Assurant, Inc. did not have, during the Reporting
Period, sufficient policies and procedures to capture the information with
respect to the Platform Transactions necessary to determine compliance with
1122(d)(4)(xii). As of January 1, 2008, Assurant, Inc. has implemented practices
and procedures to capture the information necessary to assess compliance with
Section 1122(d)(4)(xii).




Item 1123 of Regulation AB, Servicer Compliance Statement.

The servicer compliance statements are attached hereto under Item 15.



                               Part IV

  Item 15. Exhibits, Financial Statement Schedules.

  (a) Exhibits.

  (4.1) Pooling and Servicing Agreement, dated December 1, 2006, among Bear
  Stearns Asset Backed Securities I LLC, as depositor, Wells Fargo Bank,
  National Association, as securities administrator, EMC Mortgage Corporation,
  as sponsor and master servicer, and Citibank, N.A., as trustee (As
  previously filed on Form 8-K filed on February 1, 2007 and Form 8-K/A filed
  on August 23, 2007 and hereby incorporated by reference into this report on
  Form 10-K)

  (10.1) Custodial Agreement, dated January 17, 2007, by and among Citibank, N.
  A., as trustee, Bear Stearns Asset Backed Securities I LLC, EMC Mortgage
  Corporation as Master Servicer, seller and sponsor and as a servicer, Wells
  Fargo Bank, N.A., as securities administrator, as servicer and as custodian
  (As previously filed on Form 8-K filed on February 1, 2007 and Form 8-K/A
  filed on August 23, 2007 hereby incorporated by reference into this report
  on Form 10-K)

  (10.2) Seller's Warranties and Servicing Agreement between EMC Mortgage
  Corporation and Wells Fargo Bank, N.A. dated December 1, 2006. (As
  previously filed on Form 8-K filed on August 23, 2007 hereby incorporated by
  reference into this report on Form 10-K)

  (10.3) Servicing Agreement, between Bear Stearns Asset Backed Securities I
  LLC and EMC Mortgage Corporation, dated December 1, 2006 (As previously
  filed on Form 8-K filed on August 23, 2007 hereby incorporated by reference
  into this report on Form 10-K)

  (10.4) Assignment, Assumption and Recognition, dated January 17, 2007, by
  EMC Mortgage Corporation, Citibank, N.A., as trustee and Wells Fargo Bank, N.
  A. (As previously filed on Form 8-K filed on August 23, 2007 hereby
  incorporated by reference into this report on Form 10-K)

  (31) Rule 13a-14(d)/15d-14(d) Certification.

  (33) Reports on assessment of compliance with servicing criteria for
  asset-backed securities.


    <TABLE>
    
      <c>

    33.1 Assurant, Inc. as Sub-Contractor for EMC Mortgage
    33.2 EMC Mortgage Corporation as Servicer
    33.3 EMC Mortgage Corporation as Master Servicer
    33.4 FIS Tax Services as Sub-Contractor for EMC Mortgage
    33.5 LandAmerica Tax and Flood Services, Inc. as Sub-Contractor for EMC Mortgage
    33.6 Wells Fargo Bank, N.A. as Servicer
    33.7 Wells Fargo Bank, N.A. as Securities Administrator
    33.8 Wells Fargo Bank, N.A. as Custodian

    </TABLE>


  (34) Attestation reports on assessment of compliance with servicing criteria
  for asset-backed securities.


    <TABLE>
    
      <c>

    34.1 Assurant, Inc. as Sub-Contractor for EMC Mortgage
    34.2 EMC Mortgage Corporation as Servicer
    34.3 EMC Mortgage Corporation as Master Servicer
    34.4 FIS Tax Services as Sub-Contractor for EMC Mortgage
    34.5 LandAmerica Tax and Flood Services, Inc. as Sub-Contractor for EMC Mortgage
    34.6 Wells Fargo Bank, N.A. as Servicer
    34.7 Wells Fargo Bank, N.A. as Securities Administrator
    34.8 Wells Fargo Bank, N.A. as Custodian

    </TABLE>


   (35) Servicer compliance statement.


    <TABLE>
    
       <c>

    35.1 EMC Mortgage Corporation as Servicer
    35.2 EMC Mortgage Corporation as Master Servicer
    35.3 Wells Fargo Bank, N.A. as Servicer
    35.4 Wells Fargo Bank, N.A. as Securities Administrator

    </TABLE>


   (b) Not applicable.

   (c) Omitted.



                          SIGNATURES


  Pursuant to the requirements of Section 13 or 15(d) of the Securities
  Exchange Act of 1934, the registrant has duly caused this report to be
  signed on its behalf by the undersigned, thereunto duly authorized.


   Bear Stearns Asset Backed Securities Trust 2007-SD1
   (Issuing Entity)

   EMC Mortgage Corporation
   (Master Servicer)

   /s/ Jenna L. Kemp
   Jenna L. Kemp, Executive Vice President
   (senior officer in charge of the servicing function of the master
   servicer)


    Date:   March 31, 2008



  Exhibit Index

  Exhibit No.


   (4.1) Pooling and Servicing Agreement, dated December 1, 2006, among Bear
   Stearns Asset Backed Securities I LLC, as depositor, Wells Fargo Bank,
   National Association, as securities administrator, EMC Mortgage Corporation,
    as sponsor and master servicer, and Citibank, N.A., as trustee (As
   previously filed on Form 8-K filed on February 1, 2007 and Form 8-K/A filed
   on August 23, 2007 and hereby incorporated by reference into this report on
   Form 10-K)

   (10.1) Custodial Agreement, dated January 17, 2007, by and among Citibank,
   N.A., as trustee, Bear Stearns Asset Backed Securities I LLC, EMC Mortgage
   Corporation as Master Servicer, seller and sponsor and as a servicer, Wells
   Fargo Bank, N.A., as securities administrator, as servicer and as custodian
   (As previously filed on Form 8-K filed on February 1, 2007 and Form 8-K/A
   filed on August 23, 2007 hereby incorporated by reference into this report
   on Form 10-K)

   (10.2) Seller's Warranties and Servicing Agreement between EMC Mortgage
   Corporation and Wells Fargo Bank, N.A. dated December 1, 2006. (As
   previously filed on Form 8-K filed on August 23, 2007 hereby incorporated
   by reference into this report on Form 10-K)

   (10.3) Servicing Agreement, between Bear Stearns Asset Backed Securities I
   LLC and EMC Mortgage Corporation, dated December 1, 2006 (As previously
   filed on Form 8-K filed on August 23, 2007 hereby incorporated by reference
   into this report on Form 10-K)

   (10.4) Assignment, Assumption and Recognition, dated January 17, 2007, by
   EMC Mortgage Corporation, Citibank, N.A., as trustee and Wells Fargo Bank,
   N.A. (As previously filed on Form 8-K filed on August 23, 2007 hereby
   incorporated by reference into this report on Form 10-K)

   (31) Rule 13a-14(d)/15d-14(d) Certification.

   (33) Reports on assessment of compliance with servicing criteria for
   asset-backed securities.


    <TABLE>

    
      <c>
    33.1 Assurant, Inc. as Sub-Contractor for EMC Mortgage
    33.2 EMC Mortgage Corporation as Servicer
    33.3 EMC Mortgage Corporation as Master Servicer
    33.4 FIS Tax Services as Sub-Contractor for EMC Mortgage
    33.5 LandAmerica Tax and Flood Services, Inc. as Sub-Contractor for EMC Mortgage
    33.6 Wells Fargo Bank, N.A. as Servicer
    33.7 Wells Fargo Bank, N.A. as Securities Administrator
    33.8 Wells Fargo Bank, N.A. as Custodian

    </TABLE>

   (34) Attestation reports on assessment of compliance with servicing
   criteria for asset-backed securities.


    <TABLE>

    
      <c>
    34.1 Assurant, Inc. as Sub-Contractor for EMC Mortgage
    34.2 EMC Mortgage Corporation as Servicer
    34.3 EMC Mortgage Corporation as Master Servicer
    34.4 FIS Tax Services as Sub-Contractor for EMC Mortgage
    34.5 LandAmerica Tax and Flood Services, Inc. as Sub-Contractor for EMC Mortgage
    34.6 Wells Fargo Bank, N.A. as Servicer
    34.7 Wells Fargo Bank, N.A. as Securities Administrator
    34.8 Wells Fargo Bank, N.A. as Custodian

    </TABLE>

   (35) Servicer compliance statement.


    <TABLE>

    
       <c>
    35.1 EMC Mortgage Corporation as Servicer
    35.2 EMC Mortgage Corporation as Master Servicer
    35.3 Wells Fargo Bank, N.A. as Servicer
    35.4 Wells Fargo Bank, N.A. as Securities Administrator

    </TABLE>