Back in January 2010, when we
announced the possibility of
Windows 7 SP1 being released soon, many people were surprised. Few days later we got hold of the
leaked screenshots which proved that the information is not a rumor. And mid-last month, a
leaked version of Windows 7 SP1 made rounds on blogosphere and the torrent sites. Now again, a new version of
Windows 7 Service Pack 1 has been
leaked on the torrent websites carrying the
Build 7601.16556.
Blogsdna reports that
Wzor the prime source of multiple Windows 7 Build leaks also continues to leak Windows 7 Service Pack 1. Now it’s Windows 7 SP1 Build 7601.16556.100421-1510 v.172 leaked by Wzor.

Similar to the previous leaked version, all we can see are bug fixes and nothing new. Here are hashes of Windows 7 Build 7601.16556.100421-1510 SP1.
BUILD: 7601.16556.100421-1510; Service Pack 1, v.172
FILE: 7601.16556.100421-1510_Update_Sp_Wave0-B1SP1.0_DVD.iso
SIZE: 1,306,019,840 Byte
CRC: 9EEC87D7
MD5: ADD8D6C1C17CAAF3C4C4B7A86BBE164A
SHA1: 0DE53C0F707FF9DD81457F7290B4A6E6E66EA089
Wzor has also posted details of Windows 7 Development process which is as follows,
4/14/2010 - Beta Release!
4/12/2010 - Beta Release to HTP RTM
4/14-6/11 - Beta Deployment and Feedback
5/10-5/21 - Win7 BTP
6/07/2010 - HTP RTW
5/17-6/11 - RC FTP
6/21/2010 - FORK RC
We repeat - installing leaked (unauthorized)...