Exhibit 12.1

CERTIFICATION

I, Dov Moran, certify that:

1.      I have reviewed this annual report on Form20-F of M-Systems Flash Disk Pioneers Ltd.;

2.      Based on myknowledge, this annual report does not contain any untrue statement of amaterial fact or omit to state a material fact necessary to make the statementsmade, in light of the circumstances under which such statements were made, notmisleading with respect to the period covered by this annual report; 

3.      Based on my knowledge, the financialstatements, and other financial information included in this annual report,fairly present in all material respects the financial condition, results ofoperations and cash flows of the company as of, and for, the periods presentedin this annual report;

4.      The company`s other certifyingofficer(s) and I are responsible for establishing and maintaining disclosurecontrols and procedures (as defined in Exchange Act Rules 13a-15(e) and15d-15(e)) and internal control over financial reporting (as defined inExchange Act Rules 13a-15(f) and 15d-15(f)) for the company and have:

a)   Designed such disclosure controls and procedures, orcaused such disclosure controls and procedures to be designed under oursupervision, to ensure that material information relating to the company,including its consolidated subsidiaries, is made known to us by others withinthose entities, particularly during the period in which this annual report isbeing prepared;

b)   Designed such internal control over financialreporting, or caused such internal control over financial reporting to bedesigned under our supervision, to provide reasonable assurance regarding thereliability of financial reporting and the preparation of financial statementsfor external purposes in accordance with generally accepted accountingprinciples

c)   Evaluated the effectiveness of the company`sdisclosure controls and procedures and presented in this annual report ourconclusions about the effectiveness of the disclosure controls and procedures,as of the end of the period covered by this annual report based on suchevaluation; and

d)   Disclosed in this annual report any change in thecompany`s internal control over financial reporting that occurred during theperiod covered by the annual report that has materially affected, or isreasonably likely to materially affect, the company`s internal control overfinancial reporting; and

5.      The company`s other certifyingofficer(s) and I have disclosed, based on our most recent evaluation ofinternal control over financial reporting, to the company`s auditors and theaudit committee of the company`s board of directors (or persons performing theequivalent functions):

a)   All significant deficiencies and material weaknessesin the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the company`sability to record, process, summarize and reportfinancial information; and

b)   Any fraud, whether or not material, that involvesmanagement or other employees who have a significant role in the company`sinternal control over financial reporting.

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Date: May 26th, 2005   By: /s/ Dov Moran                   

Dov Moran, President and Chief Executive Officer

M-Systems Flash Disk Pioneers Limited

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