Bin, cores, usr..... ect are shown in my drive... why?

hi
i'm having a really big problem with my macbook....??
so many files are shown in my hard drive like (bin, cores, usr..... ect)????
before it wasn't shown, after i erase my drive and installed the new mac ox 10.5 it's shown, and it's really complicated know when i enter to my hard drive search for the application folder between alot of system files i think.
please is there anyway to hide these unwanted folders?

Hi Steve, I hadn't had occasion to try the .hidden file in Leopard, so I just now used it to hide my Developer folder...sure enough, the Finder will still read a .hidden file. Imagine that!
However, Apple seems to once again have changed its methodology for hiding such items from the GUI. The New Official Method is to set the invisible flag for most of the items. To see if the flag has been set you use a list all long form, with a capital letter O (which adds the flag in the output):
NoobiX:~ francine$ ls -alO /
Hit the return key. Here's a sample of the output you should see:
-rw------- 1 root wheel hidden 65536 Nov 8 00:11 .hotfiles.btree
drwxr-xr-x@ 2 root wheel hidden 68 Sep 24 00:08 .vol
drwxrwxr-x@ 83 root admin - 2822 Feb 4 00:12 Applications
-rw-r--r--@ 1 root admin hidden 57344 Feb 2 12:55 Desktop DB
-rw-r--r--@ 1 root admin hidden 2 Nov 8 01:58 Desktop DF
drwxrwxr-t@ 58 root admin - 1972 Jan 31 00:13 Library
drwxr-xr-x@ 2 root wheel hidden 68 Sep 23 14:37 Network
drwxr-xr-x@ 5 root wheel - 170 Nov 15 15:46 System
drwxr-xr-x@ 7 root admin - 238 Jan 26 15:01 Users
drwxrwxrwt@ 7 root admin hidden 238 Feb 8 11:31 Volumes
drwxr-xr-x@ 40 root wheel hidden 1360 Nov 8 00:00 bin
The things that you shouldn't see have the hidden flag. You can add the hidden flag with this Terminal command if it is missing:
NoobiX:~ francine$ sudo chflags hidden /bin
You'll be asked for your admin password, which is not echoed to the screen in any way whatsoever, so type carefully! Hit the return key again. After you have issued the chflags command for each item you wish to be hidden you can relaunch the Finder.
Francine
Francine
Schwieder

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