* USB Device Access
@ 2004-10-19 11:23 Jeba Anandhan A
2004-10-19 14:03 ` Jan-Benedict Glaw
0 siblings, 1 reply; 2+ messages in thread
From: Jeba Anandhan A @ 2004-10-19 11:23 UTC (permalink / raw)
To: linux-kernel
Hi,
i have one USB Flash Disk.when i attached to it,linux
2.4.20-8 detected it as /dev/sda1.my question,i wish
to write some raw data and read raw data.it consist
fat filesystem.how to do it.[shall i need to mount the
device in some directory].
expecting reply
urgent please
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^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: USB Device Access
2004-10-19 11:23 USB Device Access Jeba Anandhan A
@ 2004-10-19 14:03 ` Jan-Benedict Glaw
0 siblings, 0 replies; 2+ messages in thread
From: Jan-Benedict Glaw @ 2004-10-19 14:03 UTC (permalink / raw)
To: Jeba Anandhan A; +Cc: linux-kernel
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On Tue, 2004-10-19 04:23:46 -0700, Jeba Anandhan A <jeba_career@yahoo.com>
wrote in message <20041019112347.93552.qmail@web50608.mail.yahoo.com>:
> i have one USB Flash Disk.when i attached to it,linux
> 2.4.20-8 detected it as /dev/sda1.my question,i wish
No, it doesn't. It will detect it as /dev/sda and additionally create a
partition (/dev/sda1) for it).
> to write some raw data and read raw data.it consist
> fat filesystem.how to do it.[shall i need to mount the
> device in some directory].
Well, it depends on what you actually want:
- Raw data in a file inside a partition:
Mount the filesystem of the partition somewhere and open() the file
- Raw data inside the partition:
open() the partition (/dev/sda1 in your case); this'll probably
destroy the filesystem that it contains.
- Raw data directly on the (unpartitioned) device:
open() the device (/dev/sda) and write to it. That will probably
kill the partition table as well as the filesystem in this
partition.
By the way, this isn't really a kernel question, and if it's "urgent",
you'd probably ask your boss to send us some $$ for helping you...
MfG, JBG
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