虽然零售光盘还没邮寄到，但是自己已经等不及了，从网上下载了一个雪豹零售版（10432A）的镜像回来。正准备安装的时候，突然在麦芽地，Macidea等地方发现了有人说下载版MD5值和正版碟的MD5值不同。赶紧查了一下。其实这只是个误会而已。
说MD5值与正版碟不同的人用的校验方法肯定是直接检查的DMG镜像的MD5值，而在MAC OS中通用的方法是挂载镜像，然后检查MD5值。
DMG类似于ISO，只是一种封装格式，其内部使用什么格式是可以变化的，包括压缩算法和压缩比、是否可读写等等。举个例子，同样一个文件使用zip压缩，一个选择低压缩比，一个选择高压缩比，出来的两个压缩文件md5校验一定是不同的，因此对dmg直接校验是没有任何意义的！
这就是为什么我们在磁盘工具里选择对挂载之后的dmg或者干脆就是刻录好的光盘进行镜像校验，只有这样才能保证校验的对象是同一个！
所以其实两个MD5都是正确的，只是方法不同而已。
下边是三种不同的检测方法，得到的MD5有所不同，但是都是同一张盘，已经证实，先前泄露的10432A和正式版光盘是一模一样的。
Windows下校验值为（检验对象：h-sl106.dmg）
CRC32: 0D9AAA01
MD5: 1D1FB7ECA55470143C153F7F902B4ADA
SHA-1: B8AA5C0DCB0830D9B9888676ACCC2667A4034B4A
MAC OS 磁盘工具对挂载镜像检验（检验对象：盘符 Mac OS Install DVD ）
CRC32: $713800C0
MD5: $FD619787FE90525ECE05ECBCFF651B92
MAC OS 磁盘工具对DMG镜像检验（检验对象：h-sl106.dmg）
MD5: $817F2D9CFB56885D6E8E3FD99855B691
Mac OS X 10.6 Snow Leopard v10.6 Build 10A432 Retail（DMG镜像）雪豹正式零售版
BT种子下载
MAC.OSX.SNOW.LEOPARD.V10.6-HOTiSO.rar
Megaupload下载
http://www.megaupload.com/?d=O66BCWMU
http://www.megaupload.com/?d=RNGL5S6O
http://www.megaupload.com/?d=MC8DQSMG
http://www.megaupload.com/?d=4Y1B6ENP
http://www.megaupload.com/?d=UQRT806W
http://www.megaupload.com/?d=0F7GQFHF
http://www.megaupload.com/?d=WP9XNDFI
http://www.megaupload.com/?d=7C8RL6AA
http://www.megaupload.com/?d=ZHF6KCW6
http://www.megaupload.com/?d=XIBJRCK7
http://www.megaupload.com/?d=9FT2IC57
http://www.megaupload.com/?d=F407NWUN
http://www.megaupload.com/?d=FIYJX8WL
http://www.megaupload.com/?d=OZR81OWX
http://www.megaupload.com/?d=E09UIZ39
http://www.megaupload.com/?d=T8KQKWD4
http://www.megaupload.com/?d=3ZCTZCKT
http://www.megaupload.com/?d=0A2FM1PZ
http://www.megaupload.com/?d=6C1UY3G6
http://www.megaupload.com/?d=UODSDOAN
http://www.megaupload.com/?d=8RCELKR3
http://www.megaupload.com/?d=1EENL788
http://www.megaupload.com/?d=4VJQ3YTP
http://www.megaupload.com/?d=Q8W0YCWT
http://www.megaupload.com/?d=A9ETDSG1
http://www.megaupload.com/?d=A3YRZE1O
http://www.megaupload.com/?d=6QURV723
http://www.megaupload.com/?d=2Y271FXX
http://www.megaupload.com/?d=SVRY4BKB
http://www.megaupload.com/?d=SYHLF0I0
http://www.megaupload.com/?d=KC7XSNWD
http://www.megaupload.com/?d=DJB9KJSY
http://www.megaupload.com/?d=X4WPLZCX
http://www.megaupload.com/?d=K2TF0BM1
http://www.megaupload.com/?d=WNTG7AD5
http://www.megaupload.com/?d=V04OW81W
http://www.megaupload.com/?d=BSLVJMH8
http://www.megaupload.com/?d=Y517O9MK
http://www.megaupload.com/?d=ZXDAD3YZ
http://www.megaupload.com/?d=EAP6D92H
http://www.megaupload.com/?d=ASZASX8E
http://www.megaupload.com/?d=ZI8AUL1R
http://www.megaupload.com/?d=8WNXU0GC
http://www.megaupload.com/?d=NJHNYINN
http://www.megaupload.com/?d=FXDON860
http://www.megaupload.com/?d=A5SI78O0
http://www.megaupload.com/?d=X6ZQ3G6X
http://www.megaupload.com/?d=LTTOKKEC
http://www.megaupload.com/?d=DWPCIZRY
http://www.megaupload.com/?d=40KN5L4T
http://www.megaupload.com/?d=HE2BEABY
http://www.megaupload.com/?d=8HNBEBWH
http://www.megaupload.com/?d=8UQRS5IE
http://www.megaupload.com/?d=A1W0DG50
http://www.megaupload.com/?d=QWGKY8GT
http://www.megaupload.com/?d=SMEGLW1M
http://www.megaupload.com/?d=Q5EQW3DB
http://www.megaupload.com/?d=OC7TFLK4
http://www.megaupload.com/?d=H8V4Z6T0
http://www.megaupload.com/?d=ZT7S3EOP
http://www.megaupload.com/?d=S0J00GMM
http://www.megaupload.com/?d=0KN9XQFT
http://www.megaupload.com/?d=0JI2IZJ9
http://www.megaupload.com/?d=NS7QDHOB
http://www.megaupload.com/?d=PTVLVOAN
http://www.megaupload.com/?d=HAFT122V