Dismount multiple external hard disk drives

I have multiple external hard disk drives and was wondering what the command line is that will dismount all of these at once? Note that there is also one external DVD unit as well which I would not want to dismount.
Thanks,
Lyman

diskutil unmount "/path/to/disk";diskutil unmount "/path/to/disk";diskutil unmount "/path/to/disk"
Just replace replace "/path/to/disk" with the path to the mount point, leaving the quotes.
Good luck!

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    /dev/sda3 6673 12161 44090392+ f W95 Ext'd (LBA)
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    /dev/sda6 11909 12161 2032191 82 Linux swap / Solaris
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    Thu Sep 17 19:09:26 2009
    Command line: TestDisk
    TestDisk 6.8, Data Recovery Utility, August 2007
    Christophe GRENIER
    Linux version (ext2fs lib: 1.40.2, ntfs lib: 9:0:0, reiserfs lib: 0.3.1-rc8, ewf lib: none)
    Using locale 'C'.
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    Disk /dev/sdb - 60 GB / 55 GiB - CHS 57231 64 32, sector size=512
    Disk /dev/sdb - 60 GB / 55 GiB
    Partition table type: Intel
    Interface Advanced
    New options :
    Dump : No
    Cylinder boundary : Yes
    Allow partial last cylinder : No
    Expert mode : No
    Analyse Disk /dev/sdb - 60 GB / 55 GiB - CHS 57231 64 32
    Current partition structure:
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    Ask the user for vista mode
    Computes LBA from CHS for Disk /dev/sdb - 60 GB / 55 GiB - CHS 57232 64 32
    Allow partial last cylinder : Yes
    search_vista_part: 1
    search_part()
    Disk /dev/sdb - 60 GB / 55 GiB - CHS 57232 64 32
    Search for partition aborted
    Results
    interface_write()
    No partition found or selected for recovery
    search_part()
    Disk /dev/sdb - 60 GB / 55 GiB - CHS 57232 64 32
    Search for partition aborted
    Results
    interface_write()
    No partition found or selected for recovery
    simulate write!
    write_mbr_i386: starting...
    Store new MBR code
    write_all_log_i386: starting...
    No extended partition
    Analyse Disk /dev/sdb - 60 GB / 55 GiB - CHS 57232 64 32
    Current partition structure:
    Partition sector doesn't have the endmark 0xAA55
    Ask the user for vista mode
    Allow partial last cylinder : Yes
    search_vista_part: 1
    search_part()
    Disk /dev/sdb - 60 GB / 55 GiB - CHS 57232 64 32
    Results
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    No partition found or selected for recovery
    search_part()
    Disk /dev/sdb - 60 GB / 55 GiB - CHS 57232 64 32
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    mftmirr_lcn 1650676
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    D Linux 41266 1 1 82338 26 16 84116272
    EXT3 Large file Sparse superblock Recover, 43 GB / 40 GiB
    This partition ends after the disk limits. (start=84512800, size=84116272, end=168629071, disk end=117211136)
    recover_EXT2: s_block_group_nr=0/320, s_mnt_count=31/34, s_blocks_per_group=32768
    recover_EXT2: boot_sector=0, s_blocksize=4096
    recover_EXT2: s_blocks_count 10514534
    recover_EXT2: part_size 84116272
    D Linux 41660 0 1 82732 25 16 84116272
    EXT3 Large file Sparse superblock Recover, 43 GB / 40 GiB
    This partition ends after the disk limits. (start=85319680, size=84116272, end=169435951, disk end=117211136)
    recover_EXT2: s_block_group_nr=0/320, s_mnt_count=31/34, s_blocks_per_group=32768
    recover_EXT2: boot_sector=0, s_blocksize=4096
    recover_EXT2: s_blocks_count 10514534
    recover_EXT2: part_size 84116272
    D Linux 42898 0 1 83970 25 16 84116272
    EXT3 Large file Sparse superblock Recover, 43 GB / 40 GiB
    This partition ends after the disk limits. (start=87855104, size=84116272, end=171971375, disk end=117211136)
    recover_EXT2: s_block_group_nr=0/320, s_mnt_count=31/34, s_blocks_per_group=32768
    recover_EXT2: boot_sector=0, s_blocksize=4096
    recover_EXT2: s_blocks_count 10514534
    recover_EXT2: part_size 84116272
    D Linux 43244 1 1 84316 26 16 84116272
    EXT3 Large file Sparse superblock Recover, 43 GB / 40 GiB
    This partition ends after the disk limits. (start=88563744, size=84116272, end=172680015, disk end=117211136)
    recover_EXT2: s_block_group_nr=0/320, s_mnt_count=31/34, s_blocks_per_group=32768
    recover_EXT2: boot_sector=0, s_blocksize=4096
    recover_EXT2: s_blocks_count 10514534
    recover_EXT2: part_size 84116272
    D Linux 44870 2 1 85942 27 16 84116272
    EXT3 Large file Sparse superblock Recover, 43 GB / 40 GiB
    This partition ends after the disk limits. (start=91893824, size=84116272, end=176010095, disk end=117211136)
    recover_EXT2: s_block_group_nr=0/320, s_mnt_count=31/34, s_blocks_per_group=32768
    recover_EXT2: boot_sector=0, s_blocksize=4096
    recover_EXT2: s_blocks_count 10514534
    recover_EXT2: part_size 84116272
    D Linux 44930 2 1 86002 27 16 84116272
    EXT3 Large file Sparse superblock Recover, 43 GB / 40 GiB
    This partition ends after the disk limits. (start=92016704, size=84116272, end=176132975, disk end=117211136)
    recover_EXT2: s_block_group_nr=0/320, s_mnt_count=31/34, s_blocks_per_group=32768
    recover_EXT2: boot_sector=0, s_blocksize=4096
    recover_EXT2: s_blocks_count 10514534
    recover_EXT2: part_size 84116272
    D Linux 46961 0 1 88033 25 16 84116272
    EXT3 Large file Sparse superblock Recover, 43 GB / 40 GiB
    This partition ends after the disk limits. (start=96176128, size=84116272, end=180292399, disk end=117211136)
    recover_EXT2: s_block_group_nr=0/320, s_mnt_count=31/34, s_blocks_per_group=32768
    recover_EXT2: boot_sector=0, s_blocksize=4096
    recover_EXT2: s_blocks_count 10514534
    recover_EXT2: part_size 84116272
    D Linux 47312 0 1 88384 25 16 84116272
    EXT3 Large file Sparse superblock Recover, 43 GB / 40 GiB
    This partition ends after the disk limits. (start=96894976, size=84116272, end=181011247, disk end=117211136)
    recover_EXT2: s_block_group_nr=0/320, s_mnt_count=31/34, s_blocks_per_group=32768
    recover_EXT2: boot_sector=0, s_blocksize=4096
    recover_EXT2: s_blocks_count 10514534
    recover_EXT2: part_size 84116272
    D Linux 48393 2 1 89465 27 16 84116272
    EXT3 Large file Sparse superblock Recover, 43 GB / 40 GiB
    This partition ends after the disk limits. (start=99108928, size=84116272, end=183225199, disk end=117211136)
    recover_EXT2: s_block_group_nr=0/320, s_mnt_count=31/34, s_blocks_per_group=32768
    recover_EXT2: boot_sector=0, s_blocksize=4096
    recover_EXT2: s_blocks_count 10514534
    recover_EXT2: part_size 84116272
    D Linux 49633 2 1 90705 27 16 84116272
    EXT3 Large file Sparse superblock Recover, 43 GB / 40 GiB
    This partition ends after the disk limits. (start=101648448, size=84116272, end=185764719, disk end=117211136)
    recover_EXT2: s_block_group_nr=0/320, s_mnt_count=31/34, s_blocks_per_group=32768
    recover_EXT2: boot_sector=0, s_blocksize=4096
    recover_EXT2: s_blocks_count 10514534
    recover_EXT2: part_size 84116272
    D Linux 50767 1 1 91839 26 16 84116272
    EXT3 Large file Sparse superblock Recover, 43 GB / 40 GiB
    This partition ends after the disk limits. (start=103970848, size=84116272, end=188087119, disk end=117211136)
    recover_EXT2: s_block_group_nr=0/320, s_mnt_count=31/34, s_blocks_per_group=32768
    recover_EXT2: boot_sector=0, s_blocksize=4096
    recover_EXT2: s_blocks_count 10514534
    recover_EXT2: part_size 84116272
    D Linux 51150 1 1 92222 26 16 84116272
    EXT3 Large file Sparse superblock Recover, 43 GB / 40 GiB
    This partition ends after the disk limits. (start=104755232, size=84116272, end=188871503, disk end=117211136)
    recover_EXT2: s_block_group_nr=0/320, s_mnt_count=31/34, s_blocks_per_group=32768
    recover_EXT2: boot_sector=0, s_blocksize=4096
    recover_EXT2: s_blocks_count 10514534
    recover_EXT2: part_size 84116272
    D Linux 51941 1 1 93013 26 16 84116272
    EXT3 Large file Sparse superblock Recover, 43 GB / 40 GiB
    This partition ends after the disk limits. (start=106375200, size=84116272, end=190491471, disk end=117211136)
    recover_EXT2: s_block_group_nr=0/320, s_mnt_count=31/34, s_blocks_per_group=32768
    recover_EXT2: boot_sector=0, s_blocksize=4096
    recover_EXT2: s_blocks_count 10514534
    recover_EXT2: part_size 84116272
    D Linux 52759 0 1 93831 25 16 84116272
    EXT3 Large file Sparse superblock Recover, 43 GB / 40 GiB
    This partition ends after the disk limits. (start=108050432, size=84116272, end=192166703, disk end=117211136)
    recover_EXT2: s_block_group_nr=0/320, s_mnt_count=31/34, s_blocks_per_group=32768
    recover_EXT2: boot_sector=0, s_blocksize=4096
    recover_EXT2: s_blocks_count 10514534
    recover_EXT2: part_size 84116272
    D Linux 53069 1 1 94141 26 16 84116272
    EXT3 Large file Sparse superblock Recover, 43 GB / 40 GiB
    This partition ends after the disk limits. (start=108685344, size=84116272, end=192801615, disk end=117211136)
    recover_EXT2: s_block_group_nr=0/320, s_mnt_count=31/34, s_blocks_per_group=32768
    recover_EXT2: boot_sector=0, s_blocksize=4096
    recover_EXT2: s_blocks_count 10514534
    recover_EXT2: part_size 84116272
    D Linux 53768 0 1 94840 25 16 84116272
    EXT3 Large file Sparse superblock Recover, 43 GB / 40 GiB
    This partition ends after the disk limits. (start=110116864, size=84116272, end=194233135, disk end=117211136)
    recover_EXT2: s_block_group_nr=0/320, s_mnt_count=31/34, s_blocks_per_group=32768
    recover_EXT2: boot_sector=0, s_blocksize=4096
    recover_EXT2: s_blocks_count 10514534
    recover_EXT2: part_size 84116272
    D Linux 54287 0 1 95359 25 16 84116272
    EXT3 Large file Sparse superblock Recover, 43 GB / 40 GiB
    This partition ends after the disk limits. (start=111179776, size=84116272, end=195296047, disk end=117211136)
    recover_EXT2: s_block_group_nr=0/320, s_mnt_count=31/34, s_blocks_per_group=32768
    recover_EXT2: boot_sector=0, s_blocksize=4096
    recover_EXT2: s_blocks_count 10514534
    recover_EXT2: part_size 84116272
    D Linux 54493 2 1 95565 27 16 84116272
    EXT3 Large file Sparse superblock Recover, 43 GB / 40 GiB
    This partition ends after the disk limits. (start=111601728, size=84116272, end=195717999, disk end=117211136)
    recover_EXT2: s_block_group_nr=0/320, s_mnt_count=31/34, s_blocks_per_group=32768
    recover_EXT2: boot_sector=0, s_blocksize=4096
    recover_EXT2: s_blocks_count 10514534
    recover_EXT2: part_size 84116272
    D Linux 54861 1 1 95933 26 16 84116272
    EXT3 Large file Sparse superblock Recover, 43 GB / 40 GiB
    This partition ends after the disk limits. (start=112355360, size=84116272, end=196471631, disk end=117211136)
    recover_EXT2: s_block_group_nr=0/320, s_mnt_count=31/34, s_blocks_per_group=32768
    recover_EXT2: boot_sector=0, s_blocksize=4096
    recover_EXT2: s_blocks_count 10514534
    recover_EXT2: part_size 84116272
    D Linux 54890 2 1 95962 27 16 84116272
    EXT3 Large file Sparse superblock Recover, 43 GB / 40 GiB
    This partition ends after the disk limits. (start=112414784, size=84116272, end=196531055, disk end=117211136)
    recover_EXT2: s_block_group_nr=0/320, s_mnt_count=31/34, s_blocks_per_group=32768
    recover_EXT2: boot_sector=0, s_blocksize=4096
    recover_EXT2: s_blocks_count 10514534
    recover_EXT2: part_size 84116272
    D Linux 54953 2 1 96025 27 16 84116272
    EXT3 Large file Sparse superblock Recover, 43 GB / 40 GiB
    This partition ends after the disk limits. (start=112543808, size=84116272, end=196660079, disk end=117211136)
    recover_EXT2: s_block_group_nr=0/320, s_mnt_count=31/34, s_blocks_per_group=32768
    recover_EXT2: boot_sector=0, s_blocksize=4096
    recover_EXT2: s_blocks_count 10514534
    recover_EXT2: part_size 84116272
    D Linux 56330 1 1 97402 26 16 84116272
    EXT3 Large file Sparse superblock Recover, 43 GB / 40 GiB
    This partition ends after the disk limits. (start=115363872, size=84116272, end=199480143, disk end=117211136)
    recover_EXT2: s_block_group_nr=0/320, s_mnt_count=31/34, s_blocks_per_group=32768
    recover_EXT2: boot_sector=0, s_blocksize=4096
    recover_EXT2: s_blocks_count 10514534
    recover_EXT2: part_size 84116272
    D Linux 56334 0 1 97406 25 16 84116272
    EXT3 Large file Sparse superblock Recover, 43 GB / 40 GiB
    This partition ends after the disk limits. (start=115372032, size=84116272, end=199488303, disk end=117211136)
    recover_EXT2: s_block_group_nr=0/320, s_mnt_count=31/34, s_blocks_per_group=32768
    recover_EXT2: boot_sector=0, s_blocksize=4096
    recover_EXT2: s_blocks_count 10514534
    recover_EXT2: part_size 84116272
    D Linux 57203 0 1 98275 25 16 84116272
    EXT3 Large file Sparse superblock Recover, 43 GB / 40 GiB
    This partition ends after the disk limits. (start=117151744, size=84116272, end=201268015, disk end=117211136)
    Disk /dev/sdb - 60 GB / 55 GiB - CHS 57232 64 32
    Check the harddisk size: HD jumpers settings, BIOS detection...
    The harddisk (60 GB / 55 GiB) seems too small! (< 103 GB / 95 GiB)
    The following partitions can't be recovered:
    D Linux 34129 1 1 75201 26 16 84116272
    EXT3 Large file Sparse superblock Recover, 43 GB / 40 GiB
    D Linux 34632 2 1 75704 27 16 84116272
    EXT3 Large file Sparse superblock Recover, 43 GB / 40 GiB
    D Linux 34668 0 1 75740 25 16 84116272
    EXT3 Large file Sparse superblock Recover, 43 GB / 40 GiB
    D Linux 34673 1 1 75745 26 16 84116272
    EXT3 Large file Sparse superblock Recover, 43 GB / 40 GiB
    D Linux 34699 2 1 75771 27 16 84116272
    EXT3 Large file Sparse superblock Recover, 43 GB / 40 GiB
    D Linux 34708 2 1 75780 27 16 84116272
    EXT3 Large file Sparse superblock Recover, 43 GB / 40 GiB
    D Linux 36338 0 1 77410 25 16 84116272
    EXT3 Large file Sparse superblock Recover, 43 GB / 40 GiB
    D Linux 36367 0 1 77439 25 16 84116272
    EXT3 Large file Sparse superblock Recover, 43 GB / 40 GiB
    D Linux 36401 2 1 77473 27 16 84116272
    EXT3 Large file Sparse superblock Recover, 43 GB / 40 GiB
    D Linux 36414 2 1 77486 27 16 84116272
    EXT3 Large file Sparse superblock Recover, 43 GB / 40 GiB
    D Linux 37949 1 1 79021 26 16 84116272
    EXT3 Large file Sparse superblock Recover, 43 GB / 40 GiB
    D Linux 37955 1 1 79027 26 16 84116272
    EXT3 Large file Sparse superblock Recover, 43 GB / 40 GiB
    D Linux 37989 1 1 79061 26 16 84116272
    EXT3 Large file Sparse superblock Recover, 43 GB / 40 GiB
    D Linux 38404 0 1 79476 25 16 84116272
    EXT3 Large file Sparse superblock Recover, 43 GB / 40 GiB
    D Linux 39636 2 1 80708 27 16 84116272
    EXT3 Large file Sparse superblock Recover, 43 GB / 40 GiB
    D Linux 41263 1 1 82335 26 16 84116272
    EXT3 Large file Sparse superblock Recover, 43 GB / 40 GiB
    D Linux 41266 1 1 82338 26 16 84116272
    EXT3 Large file Sparse superblock Recover, 43 GB / 40 GiB
    D Linux 41660 0 1 82732 25 16 84116272
    EXT3 Large file Sparse superblock Recover, 43 GB / 40 GiB
    D Linux 42898 0 1 83970 25 16 84116272
    EXT3 Large file Sparse superblock Recover, 43 GB / 40 GiB
    D Linux 43244 1 1 84316 26 16 84116272
    EXT3 Large file Sparse superblock Recover, 43 GB / 40 GiB
    D Linux 44870 2 1 85942 27 16 84116272
    EXT3 Large file Sparse superblock Recover, 43 GB / 40 GiB
    D Linux 44930 2 1 86002 27 16 84116272
    EXT3 Large file Sparse superblock Recover, 43 GB / 40 GiB
    D Linux 46961 0 1 88033 25 16 84116272
    EXT3 Large file Sparse superblock Recover, 43 GB / 40 GiB
    D Linux 47312 0 1 88384 25 16 84116272
    EXT3 Large file Sparse superblock Recover, 43 GB / 40 GiB
    D Linux 48393 2 1 89465 27 16 84116272
    EXT3 Large file Sparse superblock Recover, 43 GB / 40 GiB
    D Linux 49633 2 1 90705 27 16 84116272
    EXT3 Large file Sparse superblock Recover, 43 GB / 40 GiB
    D Linux 50767 1 1 91839 26 16 84116272
    EXT3 Large file Sparse superblock Recover, 43 GB / 40 GiB
    D Linux 51150 1 1 92222 26 16 84116272
    EXT3 Large file Sparse superblock Recover, 43 GB / 40 GiB
    D Linux 51941 1 1 93013 26 16 84116272
    EXT3 Large file Sparse superblock Recover, 43 GB / 40 GiB
    D Linux 52759 0 1 93831 25 16 84116272
    EXT3 Large file Sparse superblock Recover, 43 GB / 40 GiB
    D Linux 53069 1 1 94141 26 16 84116272
    EXT3 Large file Sparse superblock Recover, 43 GB / 40 GiB
    D Linux 53768 0 1 94840 25 16 84116272
    EXT3 Large file Sparse superblock Recover, 43 GB / 40 GiB
    D Linux 54287 0 1 95359 25 16 84116272
    EXT3 Large file Sparse superblock Recover, 43 GB / 40 GiB
    D Linux 54493 2 1 95565 27 16 84116272
    EXT3 Large file Sparse superblock Recover, 43 GB / 40 GiB
    D Linux 54861 1 1 95933 26 16 84116272
    EXT3 Large file Sparse superblock Recover, 43 GB / 40 GiB
    D Linux 54890 2 1 95962 27 16 84116272
    EXT3 Large file Sparse superblock Recover, 43 GB / 40 GiB
    D Linux 54953 2 1 96025 27 16 84116272
    EXT3 Large file Sparse superblock Recover, 43 GB / 40 GiB
    D Linux 56330 1 1 97402 26 16 84116272
    EXT3 Large file Sparse superblock Recover, 43 GB / 40 GiB
    D Linux 56334 0 1 97406 25 16 84116272
    EXT3 Large file Sparse superblock Recover, 43 GB / 40 GiB
    D Linux 57203 0 1 98275 25 16 84116272
    EXT3 Large file Sparse superblock Recover, 43 GB / 40 GiB
    Results
    interface_write()
    No partition found or selected for recovery
    simulate write!
    write_mbr_i386: starting...
    Store new MBR code
    write_all_log_i386: starting...
    No extended partition
    Interface Advanced
    Disk /dev/sdb - 60 GB / 55 GiB
    Partition table type: Intel
    Disk /dev/sdb - 60 GB / 55 GiB
    Partition table type: Intel
    New options :
    Dump : No
    Cylinder boundary : Yes
    Allow partial last cylinder : No
    Expert mode : No
    New options :
    Dump : No
    Cylinder boundary : Yes
    Allow partial last cylinder : No
    Expert mode : No
    Analyse Disk /dev/sdb - 60 GB / 55 GiB - CHS 57232 64 32
    Current partition structure:
    Partition sector doesn't have the endmark 0xAA55
    Ask the user for vista mode
    Allow partial last cylinder : No
    search_vista_part: 0
    search_part()
    Disk /dev/sdb - 60 GB / 55 GiB - CHS 57232 64 32
    Search for partition aborted
    Results
    Can't open backup.log file: No such file or directory
    interface_load
    interface_write()
    No partition found or selected for recovery
    simulate write!
    write_mbr_i386: starting...
    Store new MBR code
    write_all_log_i386: starting...
    No extended partition
    TestDisk exited normally.
    fixdisktable first output:
    % ./fixdisktable -d /dev/sdb
    Getting hard disk geometry
    cylinders=57231, heads=64, sectors=32
    end_offset: 2147482624
    FfEeSsNnBbUuFfEeSsNnBbUuFfEeSsNnBbUuFfEeSsNnBbUuFfEeSsNnBbUuFfEeSsNnBbUuFfEeSsNnBbUuFfEeSs
    EXT2 partition at offset 56832, length=(41072.398 MB) 43067531264
    Sectors: start= 111, end= 84116382, length= 84116272
    Hd,Sec,Cyl: start(3,16,0) end(28,31,41072)
    Done searching for partitions.
    Nr AF Hd Sec Cyl Hd Sec Cyl Start Size ID
    1 80 3 16 0 63 32 1023 111 84116273 83 (Interpretted)
    1 80 3 16 0 63 224 255 111 84116273 83 (RAW)
    1: 8003 1000 833f e0ff 6f00 0000 3183 0305
    2: 0000 0000 0000 0000 0000 0000 0000 0000
    3: 0000 0000 0000 0000 0000 0000 0000 0000
    4: 0000 0000 0000 0000 0000 0000 0000 0000
    Do you wish to write this partition table to disk (yes/no)? no
    fixdisktable second output:
    % ./fixdisktable -d -r -v /dev/sdb
    Getting hard disk geometry
    cylinders=57231, heads=64, sectors=32
    end_offset: 2147482624
    FfEeSsNnBbUuFfEeSsNnBbUuFfEeSsNnBbUuFfEeSsNnBbUuFfEeSsNnBbUuFfEeSsNnBbUuFfEeSsNnBbUuFfEeSs
    NTFS partition at offset 17483776, length=(17592186043512.582 MB) 184467440727622 49216
    Sectors: start= 34148, end=36028797017147916, length=36028797017113768
    Hd,Sec,Cyl: start(43,5,16) end(16,12,2096265)
    Done searching for partitions.
    Nr AF Hd Sec Cyl Hd Sec Cyl Start Size ID
    1 80 43 5 16 63 32 1023 34148 -1850199 07 (Interpretted)
    1 80 43 5 16 63 224 255 34148 -1850199 07 (RAW)
    1: 802b 0510 073f e0ff 6485 0000 a9c4 e3ff
    2: 0000 0000 0000 0000 0000 0000 0000 0000
    3: 0000 0000 0000 0000 0000 0000 0000 0000
    4: 0000 0000 0000 0000 0000 0000 0000 0000
    Do you wish to write this partition table to disk (yes/no)? no
    This string "FfEeSsNnBbUu" was repeating there for longer time and it was most probably related to debugging or a verbose mode of fixdisktable
    As I have mentioned I will try to connect the disk directly to the computer and see what will happen.
    Shall I try to correct the disk geometry to the one specified by manufacturer? Is it possible?
    Any suggestions?

  • How to install external Hard Disk Drive

    I don't know if it is a good idea or even if there are other options, but I need to know how to install a GreenDrive ex. hard disk with out screwing everythinp up. Please help

    do you mean one of these: http://www.fantomdrives.com/products/greendrive.htm ?
    if so, just plug it into your Mac using the USB or, if you have it on your Mac, the eSATA interface and the drive should show up on your Mac's desktop.
    JGG

  • Help NEEDED! External Hard Disk Drive Problem!

    Dear Forum,
    I am using MacBook with snow leopard and I am also using a WD Ext.HDD 500GB. Ok, I will described in detailed regarding what problem has occurred so that you guys can help me:D. Firstly, I formatted my wd hdd to hfs+j as the default format is NTFS. Then afterwards, I forgotten that hfs+j cannot support windows, thus I partition it to 2, with one hfs+j and one Fat32(formatted to ntfs when in windows), then I realised that my macbook don't have enough space, thus, I reformatted the whole hdd to one partition only, hfs+j. Now, the problem comes, when I formatted it to hfs+j, I found the free space not right, at default, the wd is 499.41GB(as seen on disk utility), but when I look at the hfs+j partition, the free space is only 499.06GB(as seen on disk utility with no files in it). Another thing, when I looked into the disk utility info of my hfs+j partition, there is 400+MB of hard disk space already taken. Then, I transferred one of my files(4.82GB) into my ext.hard disk, when the transfer is complete, I 'get info' my ext.hdd and found out that 5.26GB are taken up, but I have only transferred 4.82GB of files. So what is happening to my hard disk? Any ways to fix this problem guys?
    I really need your help! I will appreciate greatly if you guys can help me, thanks!:D
    Regards
    Ala.

    The odd 400MB is the hidden files put there by the system to define the file structure of the partition, plus other stuff like .Trash. It's perfectly normal and the HDD wouldn't be recognised if they weren't there.
    You will see a similar situation with the internal boot drive if you compare the Drive size (leftmost item with the manufacturers designation) and that of Macintosh HD (which is the working partition). In my case this shows 640.14 GB for the drive, 639.79 GB for Macintosh HD, a difference of 350MB
    This will be the same within about ± 50MB whatever drive you format in HFS+J, including pen drives.

  • Unable to backup to external hard disk drive (HDD)

    I am a new Mac user. I have been using a Samsung 200GB HDD as an external backup for my old PC and there have been no problems between the HDD and the PC which runs on Windows XP.
    However, when I connect my Mac to the HDD, the Mac has Read Only rights for the files in the HDD. When I transferred the files in the HDD to the Mac I could Read and Write. However, I am now unable to transfer the files back to the HDD. The message 'HDD cannot be modified' appears. I have tried re-formatting the HDD but to no avail.
    I know this probably has more to do with setting up the HDD correctly than with the Mac but can someone help? Thanks
    MacBook Pro2,1   Mac OS X (10.4.8)  

    Actually FAT32 partitions support upto 2TB. The 32GB limit idea comes from that fact that the windows XP format utility simply does not give you the option for FAT32 for partitions larger than 32GB. The reason for this is after 32GB, the cluster size doubles, and if you have many small files the filesystem loses efficiency, and microsoft basically wants you to use NTFS instead! It is still possible to format using various 3rd party utilities or under other OS's (e.g. Mac OS).
    Like the other replies in this thread, if you intend to use the disk only with mac os definetly format it as MacOS Extended. However FAT32 still is the best (and only) fully supported FS across vaious OS's (Mac OS, Window, Linux etc.) - so if you do need to share the drive FAT32 is the way to go. You can format upto 2TB so partition size should be no problem however another very important point is the 4GB filesize limit with this filesystem. FAT32 does not support files larger than 4GB. this should not affect most people, but if you are working with video, you may come across files larger than this... and trying to write such files to FAT32 will simply cause your application (e.g. video editing or backup software) to fail.

  • HT201269 How can I backup to store iphone on an external hard disk drive?

    I tried to backup my iphone, my pc did not have the storage, and I don't know how to find the select for external HDD. I dont know if this is possible to backup to external drive. I lost some of my phone contacts and now the contact list is in some alphabetical order that I find difficult to read.
    Can you tell me how to?
    I have Itunes program saved on my laptop but there is not enough storage space available to backup all my iphone info to the laptop, that is why I want to direct the storage onto the HDD.
    Do I need to download Itunes again and select save to my HDD to get the extra space?

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