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Operating Systems Linux C++ Code to Access Linux Hard Disk Sectors (with a LoopBack Virtual Hard Disk) Post 302491426 by Corona688 on Thursday 27th of January 2011 12:02:24 PM
Old 01-27-2011
The way you're using it, it contains no "files". A block device is nothing but a giant pile of undifferentiated blocks, ordered from first to last.

If you want to create a file in it, you have to know what type of partition it is, and follow that partition system's rules for how blocks are arranged into directories and files.
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devinfo(1M)						  System Administration Commands					       devinfo(1M)

NAME
devinfo - print device specific information SYNOPSIS
/usr/sbin/devinfo -i device /usr/sbin/devinfo -p device DESCRIPTION
The devinfo command is used to print device specific information about disk devices on standard out. The command can only be used by the superuser. OPTIONS
-i Prints the following device information: o Device name o Software version (not supported and prints as 0) o Drive id number (not supported and prints as 0) o Device blocks per cylinder o Device bytes per block o Number of device partitions with a block size greater than zero -p Prints the following device partition information: o Device name o Device major and minor numbers (in hexadecimal) o Partition start block o Number of blocks allocated to the partition o Partition flag o Partition tag This command is used by various other commands to obtain device specific information for the making of file systems and determining parti- tion information. If the device cannot be opened, an error message is reported. OPERANDS
device Device name. EXIT STATUS
0 Successful operation. 2 Operation failed. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ SEE ALSO
prtvtoc(1M), attributes(5) SunOS 5.10 8 May 1997 devinfo(1M)
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