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Full Discussion: Using USB Memory Sticks to backup
Top Forums UNIX for Dummies Questions & Answers Using USB Memory Sticks to backup Post 302135339 by porter on Saturday 8th of September 2007 02:18:23 AM
Old 09-08-2007
Quote:
Originally Posted by ifleet2007
I would have expected this routine to be very quick because it has no 'mechanical access' at all and just relies on the 'electronics'.
Because something is electronic it should be instantaneous?

USB is a *serial* bus, dialog goes between the USB stick and the computer over the host controller interface and appears to the operating system as a SCSI device.

So

(a) there are a number of layers and translations going on

(b) the protocol is still serial, hence each bit transferred takes a finite time.

Is it USB 1.1 or USB 2.0?

You don't have to use FAT32 with USB sticks.
 

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LEARN ABOUT FREEBSD

usb_template

USB_TEMPLATE(4) 					   BSD Kernel Interfaces Manual 					   USB_TEMPLATE(4)

NAME

     usb_template -- USB templates

SYNOPSIS

     To compile this module into the kernel, place the following line in your kernel configuration file:

	   device usb_template

     To load the module at boot time, place the following line in loader.conf(5):

	   usb_template_load="YES"

DESCRIPTION

     The usb_template module implements various USB templates that are needed when programming an USB device side driver.  A USB template consists
     of an USB device descriptor, one or more USB configuration descriptors, one or more USB interface descriptors, one or more USB endpoint
     descriptors, USB strings and additional USB descriptors.  The USB template module currently has templates for USB Mass Storage, USB CDC Eth-
     ernet and Message Transfer Protocol.  USB templates are currently selected using the "hw.usb.template" sysctl.  The "hw.usb.template" value
     can be changed at any time, but will not have any effect until the USB device has been re-enumerated.

SEE ALSO

     usb(4)

STANDARDS

     The usb_template module complies to the USB 1.0, 2.0 and 3.0 standard.

HISTORY

     The usb_template module was written by Hans Petter Selasky <hselasky@FreeBSD.org>.

BSD
								  March 18, 2014							       BSD
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