-| <a id="tf1800"></a>**1800** | Enables [!INCLUDE [ssNoVersion](../../includes/ssnoversion-md.md)] optimization when disks of different sector sizes are used for primary and secondary replica log files, in [!INCLUDE [ssNoVersion](../../includes/ssnoversion-md.md)] Always On and Log Shipping environments. This trace flag is only required to be enabled on [!INCLUDE [ssNoVersion](../../includes/ssnoversion-md.md)] instances with transaction log file residing on disk with sector size of 512 bytes. Trace Flag 1800 is not required to be enabled on disk with sector sizes larger than 4 KB. For more information, see [KB3009974](https://support.microsoft.com/kb/3009974), [KB2510009](https://support.microsoft.com/kb/2510009), and [KB926930](https://support.microsoft.com/kb/926930).<br /><br />**Applies to:** [!INCLUDE [ssSQL11](../../includes/sssql11-md.md)] Service Pack 1 CU 13, [!INCLUDE [ssSQL11](../../includes/sssql11-md.md)] Service Pack 2 CU 3, [!INCLUDE [ssSQL14](../../includes/sssql14-md.md)] RTM CU 5, and later versions.<br /><br />**Scope:** Global only. |
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