| Event Id | 491 |
| Source | ESE |
| Description | Description: Information Store (2520) An attempt to determine the minimum I/O block size for the volume "E:\" containing "E:\Exchsrvr\Mdbdata\" failed with system error 5 (0x00000005): "Access is denied. ". The operation will fail with error -1032 (0xfffffbf8). |
| Event Information | The following Micosoft article will give more information about this event. |
| Reference Links | "ID No: c1041724" Error Message and Event ID 491 When You Try to Mount the Mailbox or the Public Store |
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