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HFS +

HFS +. 10.6. 8.1. Alunos: André de Freitas Smaira Alunos: Guilherme Pereira Gomes Alunos: Rodrigo Brunelli Rodrigues Alunos: Thereza Cury Fortunato. Hierarchical File System Plus ( Apple Inc.). História. HFS+ substituiu Hierarchical File System (HFS)

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HFS +

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  1. HFS + 10.6 8.1 Alunos: André de Freitas Smaira Alunos: Guilherme Pereira Gomes Alunos: Rodrigo Brunelli Rodrigues Alunos: Thereza Cury Fortunato

  2. Hierarchical File System Plus (Apple Inc.)

  3. História • HFS+ substituiu Hierarchical File System (HFS) • 19/01/1998 - Mac OS 8.1 - Hierarchical File System Plus (HFS+) • 11/11/2002 - Mac OS X Jaguar 10.2.3 Server - Hierarchical File System Journaling (HFSJ) • 24/10/2003 - Mac OS X Panther 10.3 - Hierarchical File System X (HFSX) • 29/04/2005 - Mac OS X Tiger 10.4 - Segurança baseada em lista de controle de acesso • 28/08/2009 - Mac OS X Snow Leopard 10.6 - Sistema de compressão de arquivos

  4. De HFS para HFS+ • Suporta arquivos maiores (bloco de endereço de 32-bit ao invés de 16-bit) • Unicode ao invés de Mac OS Roman para nomes de arquivos e diretórios • Codificação de caracteres UTF-16 • 255 caracteres para cada nome

  5. Estrutura • Blocos lógicos (ou setores, geralmente 512 bytes) e Blocos de Alocação (32-bit) • Invólucro para volumes antigos funcionarem no novo modelo • 3 Árvores B (catálogo de arquivos, extensão para overflow’s no catálogo de arquivos, atributos)

  6. Comparação Tamanho máximo do arquivo exFAT (FAT64): 16 EiB = 264 bytes HFS+ : 8 EiB = 263 bytes NTFS (NT File System): 16 TB = 244bytes FAT32 (File AllocationTable): 4 GB = 232bytes Tamanho máximo do volume exFAT (FAT64): 64 ZiB = 277 bytes HFS+ : 8 EiB = 263bytes NTFS (NT File System): 256 TB = 248bytes FAT32 (File AllocationTable): 2 TB = 241bytes

  7. Referências • http://en.wikipedia.org/wiki/HFS_Plus (Acessado em 05/04/2012) • http://en.wikipedia.org/wiki/Journaling_file_system (Acessado em 01/04/2012) • http://en.wikipedia.org/wiki/OS_X (Acessado em 01/04/2012) • http://en.wikipedia.org/wiki/Mac_OS_X_v10.2 (Acessado em 01/04/2012) • http://forums.macrumors.com/showthread.php?t=1207791 (Acessado em 05/04/2012) • http://www.conversioncenter.net/bits-and-bytes-conversion (Acessado em 05/04/2012)

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