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how floppy disks, CDs and flash drives (pen drives) are accessed in UNIX


 
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Top Forums Shell Programming and Scripting how floppy disks, CDs and flash drives (pen drives) are accessed in UNIX
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Old 04-06-2007
Question how floppy disks, CDs and flash drives (pen drives) are accessed in UNIX

hi
how floppy disks, CDs and flash drives (pen drives) are accessed in UNIX?

thanks

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Test Your Knowledge in Computers #99
Difficulty: Easy
Unix has a flat file structure which allows easier access and maintenance of data.
True or False?

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UDISKS(7)							      udisks								 UDISKS(7)

NAME
udisks - Storage Management DESCRIPTION
udisks provides an interface to enumerate storage devices and perform operations on them. Any application can access the org.freedesktop.UDisks service on the system message bus. Some operations (such as formatting disks etc.) is restricted using polkit. DEVICE INFORMATION
On Linux, udisks relies on recent versions of udev(7) and the kernel. Influential device properties in the udev database include: UDISKS_PRESENTATION_HIDE If set to 1 this is a hint to presentation level software that the device should not be shown to the user. UDISKS_PRESENTATION_NOPOLICY If set to 1 this is a hint to presentation level software that the device should not be automounted or autoassembled (for e.g. components of a multi-disk device). UDISKS_DISABLE_POLLING If set to 1 this will disable the polling of drives for media changes, for devices which do not send out media notifications by themselves (this mostly affects CD drives). Some CD drives cause bad effects such as very high CPU usage when being polled. UDISKS_PRESENTATION_NAME The name to user for the device when presenting it to the user. UDISKS_PRESENTATION_ICON_NAME The icon to use when presenting the device to the user. If set, the name must follow the freedesktop.org icon theme specification. The ID_DRIVE_* properties are used to describe what kind of physical media can be used in a device. These are typically set on the main block device (e.g. /dev/sdb) and more than one these properties can be set if the device supports multiple kinds of media. ID_DRIVE_EJECTABLE Whether the media in the drive is physically ejectable. Only set this to 1 (or 0) if the drive truly uses (or doesn't) ejectable media. In particular, it is not necessary to set this for e.g. iPod or Kindle devices where it is necessary to send a command via eject(1) since the desktop user session will offer this option for removable devices regardless of whether they are ejectable. If this property is not set, a heuristic will be used to determine if the media is ejectable (drives using optical, Zip or Jaz media are considered ejectable). ID_DRIVE_DETACHABLE Whether the device is detachable. It is only meaningful to set this to 0 (to avoid marking a device as detachable) since the code for detaching the device is part of udisks itself. If this property is not set, a heuristic will be used to determine if the drive is detachable (currently only devices connected through USB are detachable). ID_DRIVE_CAN_SPINDOWN Whether the device can spin down. It is only meaningful to set this to 0 (to avoid marking a device as being capable of spinning down) since the code for spinning down the device is part of udisks itself. If this property is not set, a heuristic will be used to determine if the drive can spin down (currently only ATA devices, including those USB devices with a SAT layer) can be spun down). ID_DRIVE_FLASH The device is compatible with flash. ID_DRIVE_FLASH_CF The device is compatible with Compact Flash. ID_DRIVE_FLASH_MS The device is compatible with Memory Stick. ID_DRIVE_FLASH_SM The device is compatible with SmartMedia. ID_DRIVE_FLASH_SD The device is compatible with SecureDigital. ID_DRIVE_FLASH_SDHC The device is compatible with High-Capicity SecureDigital. ID_DRIVE_FLASH_MMC The device is compatible with MultiMediaCard. ID_DRIVE_FLOPPY The device is compatible with floppy disk. ID_DRIVE_FLOPPY_ZIP The device is compatible with Zip. ID_DRIVE_FLOPPY_JAZ The device is compatible with Jaz. The ID_DRIVE_MEDIA_* properties describe the current media in a device. As with the ID_DRIVE_* properties, these properties are typically set on the main block device (e.g. /dev/sdb). Typically only one of these properties are set. ID_DRIVE_MEDIA_FLASH The physical media currently inserted into the device is flash. ID_DRIVE_MEDIA_FLASH_CF The physical media currently inserted into the device is Compact Flash. ID_DRIVE_MEDIA_FLASH_MS The physical media currently inserted into the device is Memory Stick. ID_DRIVE_MEDIA_FLASH_SM The physical media currently inserted into the device is SmartMedia. ID_DRIVE_MEDIA_FLASH_SD The physical media currently inserted into the device is SecureDigital. ID_DRIVE_MEDIA_FLASH_SDHC The physical media currently inserted into the device is High-Capicity SecureDigital. ID_DRIVE_MEDIA_FLASH_MMC The physical media currently inserted into the device is MultiMediaCard. ID_DRIVE_MEDIA_FLOPPY The physical media currently inserted into the device is floppy disk. ID_DRIVE_MEDIA_FLOPPY_ZIP The physical media currently inserted into the device is Zip. ID_DRIVE_MEDIA_FLOPPY_JAZ The physical media currently inserted into the device is Jaz. REMOTE CLIENTS
TODO: write me. AUTHOR
Written by David Zeuthen david@fubar.dk with a lot of help from many others. BUGS
Please send bug reports to either the distribution bug tracker or the upstream bug tracker at http://bugs.freedesktop.org/enter_bug.cgi?product=udisks. SEE ALSO
udev(7), polkit(8), udisks-daemon(8), udisks-tcp-bridge(1), udisks(1) udisks March 2008 UDISKS(7)

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