The parties debate whether plaintiffs must demonstrate prejudice before the Court can impose lesser sanctions. The Ninth Circuit has recognized that it has sent conflicting signals regarding whether prejudice must be shown in order for the sanction of dismissal to be appropriate. A court in this district recently clarified that the Ninth Circuit has required a showing of prejudice only when courts are acting under Federal Rule of Civil Procedure 37, which applies when a party disobeys a court order regarding discovery. When acting under its inherent authority, however, a district court need not consider prejudice to the party moving for sanctions…and prejudice has not been required when a party moves for lesser sanctions. Here, the Court is considering lesser sanctions in the form of an adverse inference, and even assuming prejudice is required, the Court notes that it would be quite difficult for plaintiffs to demonstrate how they were harmed by evidence to which they do not have access.
Nursing Home Pension Fund v. Oracle Corp., 2008 WL 4093497 at *5 (N.D.Cal. Sept. 2, 2008) (internal citations removed).