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One puts the file system (usually FAT32) directly on the device without partitioning, making it start from sector 0 without additional boot sectors, headers or partitions.To a host, the USB device acts as an external hard drive; the protocol set interfaces with a number of storage devices.While MSC is the original abbreviation, UMS (Universal Mass Storage) has also come into common use.
There is no support for USB supplied by Microsoft in Windows before Windows 95 and Windows NT 4.0. Windows 95 OSR2.1, an update to the operating system, featured limited support for USB. Usb Mass Storage Device Driver Was ProducedDuring that time no generic USB mass-storage driver was produced by Microsoft (including for Windows 98 ), and a device-specific driver was needed for each type of USB storage device. Usb Mass Storage Device Drivers Became AvailableThird-party, freeware drivers became available for Windows 98 and Windows 98SE, and third-party drivers are also available for Windows NT 4.0. Windows 2000 has support (via a generic driver) for standard USB mass-storage devices; Windows Me and all later Windows versions also include support. Usb Mass Storage Device Portable Devices TypicallyHowever, portable devices typically cannot provide enough power for hard-drive disk enclosures (a 2.5-inch (64 mm) hard drive typically requires the maximum 2.5 W in the USB specification) without a self-powered USB hub. A Windows Mobile device cannot display its file system as a mass-storage device unless the device implementer adds that functionality. However, third-party applications add MSC emulation to most WM devices (commercial Softick CardExport and free WM5torage). Only memory cards (not internal-storage memory) can generally be exported, due to file-systems issues; see device access, below. Beginning with Windows 7, Microsoft limited AutoRun to CD and DVD drives, updating previous Windows versions. Third-party generic drivers, such as Duse, USBASPI and DOSUSB, are available to support USB mass-storage devices. FreeDOS supports USB mass storage as an Advanced SCSI Programming Interface (ASPI) interface. This includes a certain portion of Android -based devices, through support of USB-OTG, since Android uses the Linux kernel. As of April 2010, the Xbox 360 (a) used a mass-storage device for saved games 4 and the PS3 allowed transfers between devices on a mass-storage device. Independent developers have released drivers for the TI-84 Plus and TI-84 Plus Silver Edition to access USB mass-storage devices. In these calculators, the usb8x driver supports the msd8x user-interface application. In practice, there is little support for specifying a command set via its subclass; most drivers only support the SCSI transparent command set, designating their subset of the SCSI command set with their SCSI Peripheral Device Type (PDT). Based on the specified command set and any subset, it provides a means to read and write sectors of data (similar to the low-level interface used to access a hard drive ). Operating systems may treat a USB mass-storage device like a hard drive; users may partition it in any format (such as MBR and GPT), and format it with any file system. Large, USB-based hard disks may be formatted with NTFS, which (except for Windows) is less supported. However, a keydrive or other device may be formatted with another file system ( HFS Plus on an Apple Macintosh, or Ext2 on Linux, or Unix File System on Solaris or BSD). This choice may limit (or prevent) access to a devices contents by equipment using a different operating system. ![]() All such devices halt their file-system ( dismount ) before making it available to a host operating system to prevent file-system corruption or other damage (although it is theoretically possible for both devices to use read-only mode or a cluster file system ). Some devices have a write-protection switch (or option) allowing them to be used in read-only mode; this makes files available for shared use without the risk of virus infection.
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