或许是个很简单的学术问题

Neiziro

一般看到压缩包后的rr3或者rr5是啥意思？

ccow

压缩比率？rr3是普通，rr5最小。

拉克西絲

设置“恢复记录”占总压缩包大小的百分比

Zak

给个准确点的答案。注意n的范围是1~524288


rr[N] Add data recovery record. Optionally, redundant information
(recovery record) may be added to an archive. This will cause
a small increase of the archive size and helps to recover
archived files in case of floppy disk failure or data losses of
any other kind. A recovery record contains up to 524288 recovery
sectors. The number of sectors may be specified directly in the
\'rr\' command (N = 1, 2 .. 524288) or, if it is not specified by
the user, it will be selected automatically according to the
archive size: a size of the recovery information will be about
1% of the total archive size, usually allowing the recovery of
up to 0.6% of the total archive size of continuously damaged data.

It is also possible to specify the recovery record size in
percent to the archive size. Just append the percent character
to the command parameter. For example:

rar rr3% arcname

Note that if you run this command from .bat or .cmd file,
you need to use rr3%% instead of rr3%, because the command
processor treats the single \'%\' character as the start of
a batch file parameter. You may also use \'p\' instead of \'%\',
so \'rr3p\' will work too.

If data is damaged continuously, then each rr-sector helps to
recover 512 bytes of damaged information. This value may be
lower in cases of multiple damage.

The size of the recovery record may be approximately determined
by the formula <archive size>/256 + <number of recovery
sectors>*512 bytes.

Neiziro

OK，谢ls

再问一个问题，有些压缩包组会有压缩校验文件，这个怎么生成的？

ccow

用FlashSFV既可以校验，也能生成。

EVA1

3%恢复档，防CRC ERROR。