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Creating bin files on Windows

This is great! Just wanted to drop a note that Windows also has a tool for creating bin files from the command line. The Command Prompt must be opened as Administrator, but then you can just do this:

fsutil file createnew 1mb.bin 1000000
fsutil file createnew 5mb.bin 5000000
fsutil file createnew 10mb.bin 10000000
fsutil file createnew 100mb.bin 100000000
fsutil file createnew 1000mb.bin 1000000000

tweak dd instructions for reduced disk usage

You might want to change the 'dd' instructions a bit. If you use sparse files, you can have each file only consume one block of storage on the disk while having a much bigger file. To do this, you write a single block with dd and "seek" to the last block of the file.

For instance:

   dd if=/dev/zero of=1mb.bin   bs=1024 count=1 seek=$((  1*(1<<10) - 1))
   dd if=/dev/zero of=5mb.bin   bs=1024 count=1 seek=$((  5*(1<<10) - 1))
   dd if=/dev/zero of=10mb.bin  bs=1024 count=1 seek=$(( 10*(1<<10) - 1))
   dd if=/dev/zero of=100mb.bin bs=1024 count=1 seek=$((100*(1<<10) - 1))

$ ls -l *.bin; du -cs *.bin
-rw-rw-r-- 1 dave dave 1048576000 May  3 10:25 1000mb.bin
-rw-rw-r-- 1 dave dave  104857600 May  3 10:15 100mb.bin
-rw-rw-r-- 1 dave dave   10485760 May  3 10:15 10mb.bin
-rw-rw-r-- 1 dave dave    1048576 May  3 10:26 1mb.bin
-rw-rw-r-- 1 dave dave    5242880 May  3 10:15 5mb.bin
4	1000mb.bin
4	100mb.bin
4	10mb.bin
8	1mb.bin
4	5mb.bin
24	total

'du' shows the true on-disk storage size of the files.

missing comma in "dec" function

this line is missing in the second if

     res += '.';

        if ( ! flo && diff ) {
          res += '.';
          for ( let i = 0; i < diff; i++ ) {
            res += '0';
          }
        }

        if ( flo && diff > 0 ) {
          for ( let i = 0; i < diff; i++ ) {
            res += '0';
          }
        }

should be change to

        if ( ! flo && diff ) {
          res += '.';
          for ( let i = 0; i < diff; i++ ) {
            res += '0';
          }
        }

        if ( flo && diff > 0 ) {
          res += '.';
          for ( let i = 0; i < diff; i++ ) {
            res += '0';
          }
        }

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