California Code, Code of Civil Procedure - CCP § 2031.280

(a) Any documents or category of documents produced in response to a demand for inspection, copying, testing, or sampling shall be identified with the specific request number to which the documents respond.

(b) The documents shall be produced on the date specified in the demand pursuant to paragraph (2) of subdivision (c) of Section 2031.030, unless an objection has been made to that date.  If the date for inspection has been extended pursuant to Section 2031.270, the documents shall be produced on the date agreed to pursuant to that section.

(c) If a party responding to a demand for production of electronically stored information objects to a specified form for producing the information, or if no form is specified in the demand, the responding party shall state in its response the form in which it intends to produce each type of information.

(d) Unless the parties otherwise agree or the court otherwise orders, the following shall apply:

(e) If necessary, the responding party at the reasonable expense of the demanding party shall, through detection devices, translate any data compilations included in the demand into reasonably usable form.