** Shares of AI storage companies Sandisk SNDK.O and Western Digital WDC.O fall between 7% and 8% in extended trading
** WDC expects revenue of $3.65 billion for the fourth quarter, plus or minus $100 million, vs estimate of $3.46 billion, according to data compiled by LSEG
** SNDK expects revenue of between $7.75 billion and $8.25 billion for the fourth quarter, compared with analysts' average estimate of $6.49 billion
** Shares of WDC have risen over 150% and those of SNDK have jumped 361% YTD
(Reporting by Zaheer Kachwala)