EXHIBIT 10.2
  
  
                           FORM OF LOCK-UP LETTER 
  
  
 October 5, 1998 
  
  
 [MATRIDIGM SHAREHOLDER] 
  
  
  
 Millennium Holding Corp. 
 c/o Zitel Corporation 
 47211 Bayside Parkway 
 Fremont, California  94538 
  
 Dear Sirs: 
  
           The undersigned understands that Zitel Corporation, a California
 corporation ("Zitel") and Millennium Holding Corp., a Delaware corporation,
 on the date hereof entered into that certain Agreement and Plan of
 Reorganization and Merger by and among Zitel, Millennium Holding Corp.,
 Zenith Acquisition Corp., Millennium Acquisition I Corp. and MatriDigm (the
 "Merger Agreement") pursuant to which Zitel will acquire MatriDigm
 Corporation, a California corporation.  Under the Merger Agreement, the
 undersigned will receive shares of Holdco Common Stock in exchange for
 shares of Company Common Stock held by the undersigned immediately prior to
 the Effective Time.  Capitalized terms used but not otherwise defined
 herein shall have the respective meanings set forth in the Merger
 Agreement. 
  
           To induce Zitel to enter into the Merger Agreement, during the
 period commencing on the date hereof and ending (i) if the Merger is
 consummated prior to January 29, 1999, on the second trading day following
 the public announcement of the consolidated results of operations of Zitel
 and MatriDigm for the fiscal quarter ended March 31, 1999, and (ii) if the
 Merger is consummated after January 29, 1999, on the second trading day
 following the public announcement of the consolidated results of operations
 of Zitel and MatriDigm for the fiscal quarter ended June 30, 1999, the
 undersigned agrees not to (x) offer, pledge, sell, contract to sell, sell
 any option or contract to purchase, grant any option, right or warrant to
 purchase, or otherwise transfer or dispose of, directly or indirectly, any
 shares of Holdco Common Stock or any securities convertible into or
 exercisable or exchangeable for Holdco Common Stock (including, without
 limitation, shares of Holdco Common Stock or securities convertible into or
 exercisable or exchangeable for Holdco Common Stock which may be deemed to
 be beneficially owned by the undersigned in accordance with the rules and
 regulations of the Securities and Exchange Commission) or (y) enter into
 any swap or other arrangement that transfers all or a portion of the
 economic consequences associated with the ownership of any Holdco Common
 Stock (regardless of whether any of the transactions described in clause
 (x) or (y) is to be settled by the delivery of Holdco Common Stock, or such
 other securities, in cash or otherwise), without the prior written consent
 of Salomon Smith Barney; provided, that during such period the undersigned
 may make gifts of shares of Holdco Common Stock or securities convertible
 into Holdco Common Stock upon the condition that the donees agree to be
 bound by the foregoing restriction in the same manner as it applies to the
 undersigned; and provided, further, that with respect to securities
 convertible into or exercisable or exchangeable for Holdco Common Stock,
 the undersigned may distribute such securities to its partners or members,
 as the case may be, so long as the recipients of such securities agree to
 be bound by the foregoing restriction in the same manner as it applies to
 the undersigned[; and provided, further, that during such period, the
 undersigned shall be entitled to sell only that number of shares of Holdco
 Common Stock required to extinguish the mortgage loan existing as of the
 date hereof on the undersigned's primary residence, it being understood
 that such proceeds are to be used solely to extinguish such mortgage loan
 and not for any other purpose whatsoever(1)].
  
           The undersigned hereby represents and warrants that the
 undersigned has full power and authority to enter into the agreement set
 forth herein, and that, upon request, the undersigned will execute any
 additional documents necessary or desirable in connection with the
 enforcement hereof.  All authority herein conferred or agreed to be
 conferred shall survive the death or incapacity of the undersigned and any
 obligations of the undersigned shall be binding upon the heirs, personal
 representatives, successors, and assigns of the undersigned. 
  
                                            Very truly yours, 
  
  
                                            __________________________ 
                                            (Name - Please Type) 
                                            (Address) 
                                            (Social Security or Taxpayer
                                            Identification No.) 
  

- -------------------
(1)  Franklin Chiang letter only.



                                                                 SCHEDULE I 
  
 Number of shares of capital stock of MatriDigm owned:  ________ 
  
  
 Certificate Numbers:     __________ 
                          __________ 
                          __________ 
  
  
 Number of shares of Holdco Common Stock issuable upon  
      exchange of such securities:  ________