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476 lines
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26 KiB
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<a class="t" href="/web/20110226031619*/http://www.lvr.com/mass_storage_faq.htm" title="See a list of every capture for this URL">54 captures</a>
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Starting in 1996, <a href="http://www.alexa.com/">Alexa Internet</a> has been donating their crawl data to the Internet Archive. Flowing in every day, these data are added to the <a href="http://web.archive.org/">Wayback Machine</a> after an embargo period.
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Starting in 1996, <a href="http://www.alexa.com/">Alexa Internet</a> has been donating their crawl data to the Internet Archive. Flowing in every day, these data are added to the <a href="http://web.archive.org/">Wayback Machine</a> after an embargo period.
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<li class="background"><a href="usbchips.htm">Chips</a></li>
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<li><a href="usbcode.htm">Device Code</a></li>
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<li><a href="embedded_host.htm">Embedded Host & OTG</a></li>
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<li><a href="usb_host_software.htm">Host Software</a></li>
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<li><a href="hidpage.htm">Human Interface Devices</a></li>
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<li><a href="mass_storage.htm">Mass Storage</a></li>
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<li><a href="serport.htm">Serial Ports</a> </li>
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<li><a href="mass_storage.htm">Mass Storage</a></li>
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<li><a href="microc.htm">8052-Basic</a></li>
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<li><a href="pcbs.htm">Printed Circuit Boards</a></li>
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</div> <!-- menubar_main -->
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<div id="container_main">
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<!-- InstanceBeginEditable name="Content" -->
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<p><a href="index.html">Home</a> > <a href="usb.htm">USB Central </a>> <a href="usbms.htm">Mass Storage Page</a> >
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Mass Storage FAQ</p><p></p>
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<h1> Mass Storage FAQ</h1>
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<h4>Also see:</h4>
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<p><a href="mass_storage.htm">Mass
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storage page</a>
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</p>
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<h2 align="left">General</h2>
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<blockquote>
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<p align="left"><strong>How long can a device return NAK in a mass-storage
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bulk transfer?</strong></p>
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<p align="left">The mass-storage specification doesn't define a timeout
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value. Hosts typically will wait 20-30 seconds.</p>
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<p align="left"> <strong>Can my device's firmware read and store files when
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the device isn't attached to a host?</strong></p>
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<p align="left">Yes, if the firmware supports a file system such as FAT16
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or FAT32. Note that the mass-storage device should have only one mass-storage
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master at a time. When the device is attached to and configured by a USB
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host, the firmware shouldn't attempt to read or write to files on its
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own. </p>
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</blockquote>
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<h2 align="left">SCSI</h2>
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<blockquote>
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<p align="left"><strong>What is the SCSI transparent command set?</strong></p>
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<p align="left">In the <a href="https://web.archive.org/web/20110226031619/http://www.usb.org/developers/devclass_docs">Mass Storage Class Specification Overview</a>, Table
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2.1 says that devices with subclass code 06h implement the "SCSI
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transparent command set." The SCSI specifications are available from
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<a href="https://web.archive.org/web/20110226031619/http://www.t10.org/drafts.htm#SCSI3_Family">t10.org</a>, but these documents don't
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mention a transparent command set.</p>
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<p align="left"><a href="https://web.archive.org/web/20110226031619/https://lists.one-eyed-alien.net/pipermail/usb-storage/2004-September/000795.html">According
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to the inventor of the subclass</a>, subclass 06h means that the host should determine
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the device type by issuing a SCSI INQUIRY command. In the returned INQUIRY
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data, bits 4..0 of byte 0 specify a peripheral device type (PDT). The
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SCSI Primary Commands (SPC) specification defines various PDTs and the
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specifications they should comply with. </p>
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<p align="left"><strong>What value should I use for bInterfaceSubClass in
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the interface descriptor?</strong></p>
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<p align="left">New designs should use bInterfaceSubClass = 06h (SCSI transparent
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command set). The device's response to a SCSI INQUIRY command is then
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the single source where the device declares its command set (via the PERIPHERAL
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DEVICE TYPE (PDT) and VERSION codes). A device should use a different
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bInterfaceSubClass only if it must for some reason adhere to a command
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set that has no PDT code (such as SFF-8070i). See the SPC document for
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a list of PDTs. </p>
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<p align="left"><strong>What commands should my device support?</strong></p>
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<p align="left">In the response to a SCSI INQUIRY command, a device returns
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a PERIPHERAL DEVICE TYPE code and a VERSION code. For hard drives, flash
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|
drives, and similar devices, PERIPHERAL DEVICE TYPE = 00h (direct access
|
|
block device) and VERSION = 04h (SPC-2) or 05h (SPC-3). The code in the
|
|
VERSION corresponds to a command set, and the command set's specification
|
|
lists mandatory commands.</p>
|
|
<p align="left">In some cases, additional INQUIRY data can provide more
|
|
information, including vendor-specific data, but not every host will retrieve
|
|
more than the first 36 bytes of the response. </p>
|
|
<p align="left">The SPC specification documents the INQUIRY command. Also
|
|
see the specification for your device type for any device-specific information
|
|
about the INQUIRY response.</p>
|
|
<p align="left">In practice, many devices don't implement every mandatory
|
|
command and just concentrate on the commands used by any hosts the device
|
|
is likely to connect to.</p>
|
|
<p align="left">The <a href="https://web.archive.org/web/20110226031619/http://www.usb.org/developers/devclass_docs/MSC-compliance-0_9a.pdf">Mass
|
|
Storage Class Compliance Test Specification</a> names required and optional
|
|
commands for different PDTs that want to pass USB-IF's mass-storage compliance
|
|
tests.</p>
|
|
<p align="left"><strong>What is command 0x23 (23h)? I can't find it in the
|
|
SPC or SBC documents.</strong></p>
|
|
<p align="left">Command 23h is READ FORMAT CAPACITIES in the <a href="https://web.archive.org/web/20110226031619/http://www.t10.org/drafts.htm">Multimedia
|
|
Commands (MMC) specification</a> from t10.org.</p>
|
|
</blockquote>
|
|
<h2 align="left">Windows Specific</h2>
|
|
<blockquote>
|
|
<p align="left"><strong>Can my device use the Reduced Block Command (RBC)
|
|
set?</strong></p>
|
|
<p align="left">Windows doesn't support RBC (bInterfaceSubClass 01h or 06h
|
|
and PDT = 0Eh), so if you design an RBC device, you'll need to provide
|
|
a driver for the host. The USB mass storage overview document from usb.org
|
|
incorrectly says that flash drives typically use RBC. Flash drives use
|
|
bInterfaceSubClass 06h (SCSI transparent command set) with PDT = 00h (direct-access
|
|
block device), the same as hard drives.</p>
|
|
<p align="left"><strong>How can I determine the drive letter Windows has
|
|
assigned to a USB drive?</strong></p>
|
|
<p align="left">Three options:</p>
|
|
<p align="left">1. <a href="files/find_drive_letter.txt">Example code</a> from Marc Reinig.</p>
|
|
<p align="left">2. <a href="https://web.archive.org/web/20110226031619/http://www.codeproject.com/w2k/usbdisks.asp">How
|
|
to get the usbdisk's drive letter properly</a>. Using DeviceIoControl
|
|
to get a USB drive's letter. From f22_storm.</p>
|
|
<p align="left">3. Usenet thread <a href="https://web.archive.org/web/20110226031619/http://groups.google.com/group/microsoft.public.development.device.drivers/browse_thread/thread/47322a079ae87adc/09e0c366cacda5c0?q=%22How%2Bto%2Bmatch%2Bbetween%2Bphysical%2Busb%2Bdevice%2Band%2Bits%2Bdrive%2Bletter%22&_done=%2Fgroups%3Fas_q%3D%22How%2Bto%2Bmatch%2Bbetween%2Bphysical%2Busb%2Bdevice%2Band%2Bits%2Bdrive%2Bletter%22%26safe%3Dimages%26lr%3D%26hl%3Den%26&_doneTitle=Back%2Bto%2BSearch&&d&pli=1">How
|
|
to match between physical usb device and its drive letter</a>.</p>
|
|
</blockquote>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
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<!-- InstanceEndEditable -->
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</div> <!-- content -->
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<p><strong>Partner Links</strong></p>
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Share & access USB devices over local network or even Internet!<br>
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<p><strong><a href="https://web.archive.org/web/20110226031619/http://www.premiumusb.com/catalog/usb-duplicators_23.htm">USB Duplicator</a></strong><br>
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Copy up to 77 USB Drives at once with a stand-alone USB Duplicator.<br>
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<a href="https://web.archive.org/web/20110226031619/http://www.premiumusb.com/catalog/usb-duplicators_23.htm">www.premiumusb.com</a></p>
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<p><a href="https://web.archive.org/web/20110226031619/http://creativeusb.com/"><strong>Creative Promo USB Drives</strong></a><br>
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Custom designed promotional drives w/ branded printing and duplication.<br>
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</p><!-- #EndLibraryItem --></div>
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<!-- rightside -->
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</div>
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</div>
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<script type="text/javascript">
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var MenuBar1 = new Spry.Widget.MenuBar("MenuBar1", {imgDown:"SpryAssets/SpryMenuBarDownHover.gif", imgRight:"SpryAssets/SpryMenuBarRightHover.gif"});
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</body>
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<!-- InstanceEnd --></html>
|
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<!--
|
|
FILE ARCHIVED ON 03:16:19 Feb 26, 2011 AND RETRIEVED FROM THE
|
|
INTERNET ARCHIVE ON 12:38:43 May 12, 2018.
|
|
JAVASCRIPT APPENDED BY WAYBACK MACHINE, COPYRIGHT INTERNET ARCHIVE.
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ALL OTHER CONTENT MAY ALSO BE PROTECTED BY COPYRIGHT (17 U.S.C.
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SECTION 108(a)(3)).
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-->
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<!--
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playback timings (ms):
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LoadShardBlock: 361.029 (3)
|
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esindex: 0.006
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captures_list: 440.984
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CDXLines.iter: 13.301 (3)
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PetaboxLoader3.datanode: 174.01 (4)
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