Mac Forum / Programming / Mac Programming / October 2005

In article
<a7ca45868800aa31acf3105bfc83c6e6@localhost.talkaboutmac.com>,

The volume serial number under Windows is just a string composed of some
arbitrary bits of information like the format date and capacity. It's
very distinctly _not_ the serial number of the drive hardware. The
scheme I used to identify a volume was to call FSGetVolumeInfo to get
the creation date and size and then build a string of the 5 components
that make up those two values.

CFStringRef CreateVolumeIdentifierFromVolumeRefNum(FSVolumeRefNum
inVolume)
{
  CFStringRef theResult = NULL;
  FSVolumeInfo theVolumeInfo = {};
  FSVolumeInfoBitmap theBitmap = kFSVolInfoCreateDate | kFSVolInfoSizes;
 
  if(FSGetVolumeInfo(inVolume, 0, NULL, theBitmap, &theVolumeInfo,
NULL, NULL) == noErr)
  {
     theResult = CFStringCreateWithFormat(kCFAllocatorDefault, NULL,
                                 CFSTR("%.4X%.8X%.4X%.16qX"),
                                 theVolumeInfo.createDate.highSeconds,
                                 theVolumeInfo.createDate.lowSeconds,
                                 theVolumeInfo.createDate.fraction,
                                 theVolumeInfo.totalBytes);
  }
 
  return theResult;
}

On 25/10/2005, rolasa wrote in message
<a7ca45868800aa31acf3105bfc83c6e6@localhost.talkaboutmac.com>:

Macs don't use volume serial numbers.  In fact, Windows doesn't either:
it fakes them.  If you tell us why you think you want one we can probably
suggest some alternative strategies.

Simon.