MacTiVo Blesser 0.5 for Mac can be downloaded from our website for free. The application lies within System Tools, more precisely General.
From the developer:
MacTiVo Blesser is a formatting utility that sets Linux partitions on IDE drives for use in TiVos as "B" drives. In many cases, TiVos with one hard drive can simply "Bless" their new drive and add it - then the TiVo automatically uses it for extra recording capacity. MacTiVo Blesser performs the same function as the Linux BlessTiVo does.
You may want to check out more software for Mac, such as ESP Bless Tool, Jalview or Keynote Bingo MWSF09, which might be related to MacTiVo Blesser.