SCHEDULE 14A INFORMATION

Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

Filed by the Registrant [X]

Filed by a Party other than the Registrant [ ]

Check the appropriate box:

[ ]   Preliminary Proxy Statement

[ ]   Confidential, for Use of the Commission Only (as permitted by Rule
      14a-6(e)(2))

[ ]   Definitive Proxy Statement

[X]   Definitive Additional Materials

[ ]   Soliciting Material Pursuant to Section 240.14a-12

                              Pinnacle Data Systems, Inc.
                ------------------------------------------------
                (Name of Registrant as Specified In Its Charter)


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    (Name of Person(s) Filing Proxy Statement, if other than the Registrant)

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[X] No fee required.

[ ] Fee computed on table below per Exchange Act Rules 14a-6(i)(1) and 0-11.

      1) Title of each class of securities to which transaction applies:


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      2) Aggregate number of securities to which transaction applies:


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      3) Per unit price or other underlying value of transaction computed
      pursuant to Exchange Act Rule 0-11 (set forth the amount on which the
      filing fee is calculated and state how it was determined):


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[ ] Fee paid previously with preliminary materials.

[ ]   Check box if any part of the fee is offset as provided by Exchange Act
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      4) Date Filed: ____________________________



                      [LOGO OF PINNACLE DATA SYSTEMS, INC.]

                                                                  April 20, 2005

                              TIME IS RUNNING OUT!
                         PLEASE SUBMIT YOUR VOTE TODAY!

Dear Fellow Shareholder:

Proxy materials relating to the Annual Meeting of Shareholders for Pinnacle Data
Systems, Inc. to be held on May 5, 2005 were mailed to you recently. Our latest
records indicate that we have not received your proxy card.

The proposals set forth in the proxy statement dated March 7, 2005, are believed
to be in the best interest of the Company and its shareholders. Accordingly,
your Board of Directors recommends a vote FOR all proposals.

Regardless of the number of shares you own, it is important that they are
represented at the meeting.

If you have not mailed your proxy card, please take a moment to promptly sign,
date and mail the enclosed duplicate proxy card in the return envelope provided
for your convenience.

If you have already mailed your proxy card, please disregard this letter and
accept our thanks.

We hope you will join us for our Annual Shareholder's Meeting in Grove City,
Ohio on May 5, 2005.

                                                             Very truly yours,

                                                             /s/ John D. Bair
                                                             -------------------
                                                             John D. Bair
                                                             Chairman and CEO