This IDC Forecast Update updates the worldwide hard disk drive forecast provided in Worldwide Hard Disk Drive 2007-2011 Forecast and Analysis: Creating Space for an Expanding Digital Universe (IDC #206701, May 2007). The disk drive industry dynamics associated with the first half of 2007 and host device forecast changes are aggregated, analyzed, and applied to IDC's long-term hard disk drive forecast in terms of units and revenue (by form factor) for each consumption category of hard disk drives.