echo off

set GB=2
rem   ↑↑ ここで、ディスク/USBメモリ のだいたいの容量を指定(GB単位)

set z=01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234
for /l %%i in (1,1,128) do (
  echo %z%>>deleteme-16k.txt
)
echo deleteme-16k... created.

for /l %%i in (1,1,64) do (
  type deleteme-16k.txt >>deleteme-1m.txt
)
echo deleteme-1m... created.

for /l %%i in (1,1,128) do (
  type deleteme-1m.txt >>deleteme-128m.txt
)
echo deleteme-128m... created.

mkdir deleteme
for /l %%i in (1,1,%GB%) do (
  for /l %%j in (1,1,10) do (
    copy deleteme-128m.txt deleteme\deleteme-%%i-%%j.txt
  )
  echo wrote %%igb.
)

for /l %%i in (1,1,128) do (
  copy deleteme-1m.txt deleteme\deleteme-1m-%%i.txt
)
for /l %%i in (1,1,128) do (
  copy deleteme-16k.txt deleteme\deleteme-16k-%%i.txt
)

pause
exit