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-rw-r--r--MdeModulePkg/Bus/Ata/AtaBusDxe/AtaPassThruExecute.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/MdeModulePkg/Bus/Ata/AtaBusDxe/AtaPassThruExecute.c b/MdeModulePkg/Bus/Ata/AtaBusDxe/AtaPassThruExecute.c
index 8df584506e..d11ebd9df0 100644
--- a/MdeModulePkg/Bus/Ata/AtaBusDxe/AtaPassThruExecute.c
+++ b/MdeModulePkg/Bus/Ata/AtaBusDxe/AtaPassThruExecute.c
@@ -304,7 +304,8 @@ IdentifyAtaDevice (
// Check lowest alignment of logical blocks within physical block
//
if ((IdentifyData->alignment_logic_in_phy_blocks & (BIT14 | BIT15)) == BIT14) {
- BlockMedia->LowestAlignedLba = (EFI_LBA) (IdentifyData->alignment_logic_in_phy_blocks & 0x3fff);
+ BlockMedia->LowestAlignedLba = (EFI_LBA) (BlockMedia->LogicalBlocksPerPhysicalBlock - (IdentifyData->alignment_logic_in_phy_blocks & 0x3fff)) %
+ BlockMedia->LogicalBlocksPerPhysicalBlock;
}
}
//