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This keyY is the console-unique portion of the 3 keyslots used for everything stored under [[SD Filesystem|sdmc/Nintendo 3DS/<ID0>/<ID1>]] and [[Flash Filesystem|nand/data/<ID0>]]. This file is transferred to the destination 3DS during a [[System Transfer]]. This movable.sed counter is [[FS:InitializeCtrFileSystem|updated]] on the source 3DS during a [[System Transfer]], and when doing a system format with [[System Settings]].

This keyY is the console-unique portion of the 3 keyslots used for everything stored under [[SD Filesystem|sdmc/Nintendo 3DS/<ID0>/<ID1>]] and [[Flash Filesystem|nand/data/<ID0>]]. For SD this is used for encryption and AES MACs, however for NAND this is only used for AES MACs. This file is transferred to the destination 3DS during a [[System Transfer]]. This movable.sed counter is [[FS:InitializeCtrFileSystem|updated]] on the source 3DS during a [[System Transfer]], and when doing a system format with [[System Settings]].

Movable.sed always exists on retail, however if this file doesn't exist the system will fall-back to using a console-unique keyY already in [[PSPXI:GetLocalFriendCodeSeed|memory]], with the last 8-bytes being loaded from the 8-bytes following that u64. It's unknown whether movable.sed exists on development units.

Movable.sed always exists on retail, however if this file doesn't exist the system will fall-back to using a console-unique keyY already in [[PSPXI:GetLocalFriendCodeSeed|memory]], with the last 8-bytes being loaded from the 8-bytes following that u64. It's unknown whether movable.sed exists on development units.

The keyY is hashed with SHA256, the first 0x10-bytes from the hash is used for ID0 in [[SD Filesystem|sdmc/Nintendo 3DS/<ID0>/<ID1>]] and [[Flash Filesystem|nand/data/<ID0>]].

The keyY is hashed with SHA256, the first 0x10-bytes from the hash is used for ID0 in [[SD Filesystem|sdmc/Nintendo 3DS/<ID0>/<ID1>]] and [[Flash Filesystem|nand/data/<ID0>]].