72 lines
1.9 KiB
C
72 lines
1.9 KiB
C
/*++
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Copyright (c) 2001 Microsoft Corporation
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Module Name:
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xdisk.h
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Abstract:
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This module defines the disk configuration for an XBOX hard disk.
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--*/
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#ifndef _XDISK_
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#define _XDISK_
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//
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// Define the size of a sector on an XBOX hard disk.
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//
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#define XDISK_SECTOR_SIZE 512
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//
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// Define the number of unpartitioned sectors reserved at the start of the disk.
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// These sectors are used for various purposes such as storing data that should
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// not be visible from the file system.
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//
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#define XDISK_UNPARTITIONED_SECTORS 1024
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#define XDISK_UNPARTITIONED_SIZE (XDISK_UNPARTITION_SECTORS * XDISK_SECTOR_SIZE)
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//
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// Define the number of sectors in the shell partition (partition 2).
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//
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#define XDISK_SHELL_PARTITION_SECTORS 1024000
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#define XDISK_SHELL_PARTITION_SIZE (XDISK_SHELL_PARTITION_SECTORS * XDISK_SECTOR_SIZE)
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//
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// Define the number of sectors in each cache partition (partitions 3 to N).
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//
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#define XDISK_CACHE_PARTITION_SECTORS 1536000
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#define XDISK_CACHE_PARTITION_SIZE (XDISK_CACHE_PARTITION_SECTORS * XDISK_SECTOR_SIZE)
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//
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// Define the formula used to compute the number of cache partitions given the
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// number of user addressable sectors for the disk.
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//
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#define XDISK_NUMBER_OF_CACHE_PARTITIONS(UserAddressableSectors) \
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((((UserAddressableSectors) / 200 * 73) - \
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(XDISK_UNPARTITIONED_SECTORS + XDISK_SHELL_PARTITION_SECTORS)) / \
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XDISK_CACHE_PARTITION_SECTORS)
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//
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// Define the static partition numbers.
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//
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#define XDISK_DATA_PARTITION 1
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#define XDISK_SHELL_PARTITION 2
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#define XDISK_FIRST_CACHE_PARTITION 3
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#define XDISK_F_PARTITION 6
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//
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// Define the static number of sectors allowed for an XBOX hard disk.
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//
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#define XDISK_FIXED_SECTOR_COUNT 15633072
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#endif // XDISK
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