Western Digital 2003 Annual Report Download - page 72

Exhibit 31.2
CertiÑcation of Principal Financial OÇcer
Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
I, D. Scott Mercer, certify that:
1. I have reviewed this annual report on Form 10-K of Western Digital Corporation;
2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to
state a material fact necessary to make the statements made, in light of the circumstances under which such
statements were made, not misleading with respect to the period covered by this report;
3. Based on my knowledge, the Ñnancial statements, and other Ñnancial information included in this report,
fairly present in all material respects the Ñnancial condition, results of operations and cash Öows of the registrant as
of, and for, the periods presented in this report;
4. The registrant's other certifying oÇcer and I are responsible for establishing and maintaining disclosure
controls and procedures (as deÑned in Exchange Act Rules 13a-15(e) and 15d-15(e)) for the registrant and have:
(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures
to be designed under our supervision, to ensure that material information relating to the registrant, including
its consolidated subsidiaries, is made known to us by others within those entities, particularly during the
period in which this report is being prepared;
(b) Evaluated the eÅectiveness of the registrant's disclosure controls and procedures and presented in
this report our conclusions about the eÅectiveness of the disclosure controls and procedures, as of the end of the
period covered by this report based on such evaluation; and
(c) Disclosed in this report any change in the registrant's internal control over Ñnancial reporting that
occurred during the registrant's most recent Ñscal quarter (the registrant's fourth Ñscal quarter in the case of an
annual report) that has materially aÅected, or is reasonably likely to materially aÅect, the registrant's internal
control over Ñnancial reporting; and
5. The registrant's other certifying oÇcer and I have disclosed, based on our most recent evaluation of internal
control over Ñnancial reporting, to the registrant's auditors and the audit committee of the registrant's board of
directors (or persons performing the equivalent function):
(a) All signiÑcant deÑciencies and material weaknesses in the design or operation of internal control over
Ñnancial reporting which are reasonably likely to adversely aÅect the registrant's ability to record, process,
summarize and report Ñnancial information; and
(b) Any fraud, whether or not material, that involves management or other employees who have a
signiÑcant role in the registrant's internal control over Ñnancial reporting.
/s/ S COTT M ERCER
D. Scott Mercer
Chief Financial OÇcer
Dated: September 22, 2003