Disk Problems

[Hexren]

In which log file should I look to find disk error messages, and which
variable controls the log level for this kind of Problems (if there is
any)

Background.
I have FreeBSD 5.2.1-RELEASE-p11 running and serving my windows client
a few samba shares. (2 shares from 2 physicaly different disks to be
exact) Now when I safe something from a Firefox session running on the
Windows machine to samba share 1 my Firefox slows to a crawl. I
suspect that the Disk share 1 is located on is faulty because I do not
experience any strange behavior when saving to another disk (including
share 2)

I have cranked the Samaba Log variable up and got this error messages:
---------------------------------------------------------
[2004/10/27 22:28:45, 3] smbd/error.c:error_packet(113)
  error packet at smbd/trans2.c(1721) cmd=50 (SMBtrans2) NT_STATUS_OBJECT_NAME_NOT_FOUND
[2004/10/27 22:28:45, 3] smbd/error.c:error_packet(113)
  error packet at smbd/trans2.c(1042) cmd=50 (SMBtrans2) NT_STATUS_NO_SUCH_FILE
---------------------------------------------------------

Thx for any help
Hexren