 
 <prompt> Wetin the S for "BSoD" mean? Based on the question wey dey before, write small tori wey get the answer. E fit be 1 - 20 sentences. Context: <response>: Three milestone releases of Windows 8 don leak go general public. Milestone 1, Build 7850, leak on April 12, 2011. Na di first build wey the text of window dey write for center instead of dey align to the left. E fit be the first time wey Metro-style font show face, and the wallpaper get text wey talk say shhh... make we no leak our hard work. But the detailed build number show say the build na from September 22, 2010. The leaked copy edition na Enterprise edition. The OS still dey read as "Windows 7". Milestone 2, Build 7955, leak on April 25, 2011. The traditional Blue Screen of Death (BSoD) don change go new Black screen, but dem later cancel am. This build bring new ribbon for Windows Explorer. Build 7959, with small changes but na the first 64-bit version, leak on May 1, 2011. The "Windows 7" logo briefly change to text wey show "Microsoft Confidential". On June 17, 2011, build 7989 64-bit edition leak. E bring new boot screen wey get the same fish as default Windows 7 Beta wallpaper, wey dem later cancel, and the circling dots wey dey show for final version (although the final version get smaller circling dots throbber). E still get text wey talk Welcome below them, but dem cancel am too. 