diff --git a/reserve_disk_space.py b/reserve_disk_space.py
new file mode 100644
index 0000000..cd11272
--- /dev/null
+++ b/reserve_disk_space.py
@@ -0,0 +1,71 @@
+'''
+reserve_disk_space
+==================
+
+Exits with status of 0 if the disk has the requested amount of space, 1 if not.
+
+> reserve_disk_space reserve [drive]
+
+reserve:
+    A string like "50g" or "100 gb"
+
+drive:
+    Filepath to the drive you want to check. Defaults to cwd drive.
+'''
+import argparse
+import os
+import shutil
+import sys
+
+from voussoirkit import betterhelp
+from voussoirkit import bytestring
+from voussoirkit import dotdict
+from voussoirkit import vlogging
+
+log = vlogging.getLogger(__name__, 'reserve_disk_space')
+
+class NotEnoughSpace(Exception):
+    def __init__(self, free, reserve, drive):
+        self.free = free
+        self.reserve = reserve
+        self.drive = drive
+
+def reserve_disk_space(reserve, drive):
+    drive = drive.replace('\\', os.sep).replace('/', os.sep)
+    drive = os.path.abspath(drive)
+    drive = os.path.splitdrive(drive)[0]
+
+    log.debug('Checking drive %s', drive)
+    free = shutil.disk_usage(drive).free
+
+    if free < reserve:
+        raise NotEnoughSpace(free=free, reserve=reserve, drive=drive)
+    else:
+        return dotdict.DotDict(free=free, reserve=reserve, drive=drive)
+
+def reserve_disk_space_argparse(args):
+    try:
+        status = reserve_disk_space(reserve=bytestring.parsebytes(args.reserve), drive=args.drive)
+        free = bytestring.bytestring(status.free)
+        reserve = bytestring.bytestring(status.reserve)
+        log.info('There is %s available out of %s.', free, reserve)
+        return 0
+    except NotEnoughSpace as exc:
+        free = bytestring.bytestring(exc.free)
+        reserve = bytestring.bytestring(exc.reserve)
+        log.fatal('Only %s available out of %s.', free, reserve)
+        return 1
+
+def main(argv):
+    argv = vlogging.set_level_by_argv(log, argv)
+
+    parser = argparse.ArgumentParser(description=__doc__)
+
+    parser.add_argument('reserve')
+    parser.add_argument('drive', nargs='?', default='.')
+    parser.set_defaults(func=reserve_disk_space_argparse)
+
+    return betterhelp.single_main(argv, parser, __doc__)
+
+if __name__ == '__main__':
+    raise SystemExit(main(sys.argv[1:]))