玄箱PROは、元々はファイルサーバとしての利用を前提にしております。
Samba も既にインストールされておりますし、設定をいじる程度で問題はないだろうと考えていたのですが、私の環境では全く動作しませんでした。
Window のネットワークに共有フォルダがどうやっても表示されないのです。
そこで、Samba を一旦アンインストールして、/etc/samba/ のフォルダに残っていたファイルを全て削除して、再度Samba をインストールしました。
Samba は無事にインストールが終了しましたが、Samba を起動する事が出来なくなってしまいました。

/etc/samba/ のフォルダを見て見ると何も入っておりません。
本来なら、smb.conf とかは入っている筈なのですが、全く空になっております。
そこで、玄箱HG にインストールした時に作成されたファイルを全てコピーして見る事にしました。
それが下記の内容です。(現在、動作している状態の内容です)

[root@meckk samba]# ls -l
合計 20
-rw-r--r-- 1 root root    20 2010-06-16 21:40 lmhosts
-rw-r--r-- 1 root root 11821 2010-06-17 01:04 smb.conf
-rw-r--r-- 1 root root    97 2009-11-07 01:20 smbusers
[root@meckk samba]#

lmhosts の内容は、127.0.0.1 localhost の1行だけでした。

smbusers の内容は以下の通りです。

# Unix_name = SMB_name1 SMB_name2 ...
root = administrator admin
nobody = guest pcguest smbguest


smb.conf の内容は以下の通りです。

# This is the main Samba configuration file. For detailed information about the
# options listed here, refer to the smb.conf(5) manual page. Samba has a huge
# number of configurable options, most of which are not shown in this example.
#
# The Official Samba 3.2.x HOWTO and Reference Guide contains step-by-step
# guides for installing, configuring, and using Samba:
# http://www.samba.org/samba/docs/Samba-HOWTO-Collection.pdf
#
# The Samba-3 by Example guide has working examples for smb.conf. This guide is
# generated daily: http://www.samba.org/samba/docs/Samba-Guide.pdf
#
# In this file, lines starting with a semicolon (;) or a hash (#) are
# comments and are ignored. This file uses hashes to denote commentary and
# semicolons for parts of the file you may wish to configure.
#
# Note: Run the "testparm" command after modifying this file to check for basic
# syntax errors.
#
#---------------
# Security-Enhanced Linux (SELinux) Notes:
#
# Turn the samba_domain_controller Boolean on to allow Samba to use the useradd
# and groupadd family of binaries. Run the following command as the root user to
# turn this Boolean on:
# setsebool -P samba_domain_controller on
#
# Turn the samba_enable_home_dirs Boolean on if you want to share home
# directories via Samba. Run the following command as the root user to turn this
# Boolean on:
# setsebool -P samba_enable_home_dirs on
#
# If you create a new directory, such as a new top-level directory, label it
# with samba_share_t so that SELinux allows Samba to read and write to it. Do
# not label system directories, such as /etc/ and /home/, with samba_share_t, as
# such directories should already have an SELinux label.
#
# Run the "ls -ldZ /path/to/directory" command to view the current SELinux
# label for a given directory.
#
# Set SELinux labels only on files and directories you have created. Use the
# chcon command to temporarily change a label:
# chcon -t samba_share_t /path/to/directory
#
# Changes made via chcon are lost when the file system is relabeled or commands
# such as restorecon are run.
#
# Use the samba_export_all_ro or samba_export_all_rw Boolean to share system
# directories. To share such directories and only allow read-only permissions:
# setsebool -P samba_export_all_ro on
# To share such directories and allow read and write permissions:
# setsebool -P samba_export_all_rw on
#
# To run scripts (preexec/root prexec/print command/...), copy them to the
# /var/lib/samba/scripts/ directory so that SELinux will allow smbd to run them.
# Note that if you move the scripts to /var/lib/samba/scripts/, they retain
# their existing SELinux labels, which may be labels that SELinux does not allow
# smbd to run. Copying the scripts will result in the correct SELinux labels.
# Run the "restorecon -R -v /var/lib/samba/scripts" command as the root user to
# apply the correct SELinux labels to these files.
#
#--------------
#
#======================= Global Settings =====================================

[global]
unix charset = UTF-8
dos charset = CP932
display charset = UTF-8

printing = bsd

# ----------------------- Network-Related Options -------------------------
#
# workgroup = the Windows NT domain name or workgroup name, for example, MYGROUP.
#
# server string = the equivalent of the Windows NT Description field.
#
# netbios name = used to specify a server name that is not tied to the hostname.
#
# interfaces = used to configure Samba to listen on multiple network interfaces.
# If you have multiple interfaces, you can use the "interfaces =" option to
# configure which of those interfaces Samba listens on. Never omit the localhost
# interface (lo).
#
# hosts allow = the hosts allowed to connect. This option can also be used on a
# per-share basis.

# hosts deny = the hosts not allowed to connect. This option can also be used on
# a per-share basis.
#
        workgroup = WORKGROUP
        server string = KUROBOX-PRO

;       netbios name = MYSERVER

;       interfaces = lo eth0 192.168.12.2/24 192.168.13.2/24
;       hosts allow = 127. 192.168.12. 192.168.13.
        hosts allow = 192.168.1. 127.

# --------------------------- Logging Options -----------------------------
#
# log file = specify where log files are written to and how they are split.
#
# max log size = specify the maximum size log files are allowed to reach. Log
# files are rotated when they reach the size specified with "max log size".
#

        # log files split per-machine:
        log file = /var/log/samba/log.%m
        # maximum size of 50KB per log file, then rotate:
        max log size = 50

# ----------------------- Standalone Server Options ------------------------
#
# security = the mode Samba runs in. This can be set to user, share
# (deprecated), or server (deprecated).
#
# passdb backend = the backend used to store user information in. New
# installations should use either tdbsam or ldapsam. No additional configuration
# is required for tdbsam. The "smbpasswd" utility is available for backwards
# compatibility.
#

        security = share
        passdb backend = tdbsam


# ----------------------- Domain Members Options ------------------------
#
# security = must be set to domain or ads.
#
# passdb backend = the backend used to store user information in. New
# installations should use either tdbsam or ldapsam. No additional configuration
# is required for tdbsam. The "smbpasswd" utility is available for backwards
# compatibility.
#
#
# realm = only use the realm option when the "security = ads" option is set.
# The realm option specifies the Active Directory realm the host is a part of.
#
# password server = only use this option when the "security = server"
# option is set, or if you cannot use DNS to locate a Domain Controller. The
# argument list can include My_PDC_Name, [My_BDC_Name], and [My_Next_BDC_Name]:
#
# password server = My_PDC_Name [My_BDC_Name] [My_Next_BDC_Name]
#
# Use "password server = *" to automatically locate Domain Controllers.

;       security = domain
;       passdb backend = tdbsam
;       realm = MY_REALM

;       password server = 

# ----------------------- Domain Controller Options ------------------------
#
# security = must be set to user for domain controllers.
#
# passdb backend = the backend used to store user information in. New
# installations should use either tdbsam or ldapsam. No additional configuration
# is required for tdbsam. The "smbpasswd" utility is available for backwards
# compatibility.
#
# domain master = specifies Samba to be the Domain Master Browser, allowing
# Samba to collate browse lists between subnets. Do not use the "domain master"
# option if you already have a Windows NT domain controller performing this task.
#
# domain logons = allows Samba to provide a network logon service for Windows
# workstations.
#
# logon script = specifies a script to run at login time on the client. These
# scripts must be provided in a share named NETLOGON.
#
# logon path = specifies (with a UNC path) where user profiles are stored.
#
#
;       security = user
;       passdb backend = tdbsam

;       domain master = yes
;       domain logons = yes

        # the following login script name is determined by the machine name
        # (%m):
;       logon script = %m.bat
        # the following login script name is determined by the UNIX user used:
;       logon script = %u.bat
;       logon path = \\%L\Profiles\%u
        # use an empty path to disable profile support:
;       logon path =

        # various scripts can be used on a domain controller or a stand-alone
        # machine to add or delete corresponding UNIX accounts:

;       add user script = /usr/sbin/useradd "%u" -n -g users
;       add group script = /usr/sbin/groupadd "%g"
;       add machine script = /usr/sbin/useradd -n -c "Workstation (%u)" -M -d /nohome -s /
bin/false "%u"
;       delete user script = /usr/sbin/userdel "%u"
;       delete user from group script = /usr/sbin/userdel "%u" "%g"
;       delete group script = /usr/sbin/groupdel "%g"

# ----------------------- Browser Control Options ----------------------------
#
# local master = when set to no, Samba does not become the master browser on
# your network. When set to yes, normal election rules apply.
#
# os level = determines the precedence the server has in master browser
# elections. The default value should be reasonable.
#
# preferred master = when set to yes, Samba forces a local browser election at
# start up (and gives itself a slightly higher chance of winning the election).
#
;       local master = no
;       os level = 33
;       preferred master = yes

#----------------------------- Name Resolution -------------------------------
#
# This section details the support for the Windows Internet Name Service (WINS).
#
# Note: Samba can be either a WINS server or a WINS client, but not both.
#
# wins support = when set to yes, the NMBD component of Samba enables its WINS
# server.
#
# wins server = tells the NMBD component of Samba to be a WINS client.
#
# wins proxy = when set to yes, Samba answers name resolution queries on behalf
# of a non WINS capable client. For this to work, there must be at least one
# WINS server on the network. The default is no.
#
# dns proxy = when set to yes, Samba attempts to resolve NetBIOS names via DNS
# nslookups.

;       wins support = yes
;       wins server = w.x.y.z
;       wins proxy = yes

;       dns proxy = yes

# --------------------------- Printing Options -----------------------------
#
# The options in this section allow you to configure a non-default printing
# system.
#
# load printers = when set you yes, the list of printers is automatically
# loaded, rather than setting them up individually.
#
# cups options = allows you to pass options to the CUPS library. Setting this
# option to raw, for example, allows you to use drivers on your Windows clients.
#
# printcap name = used to specify an alternative printcap file.
#

        load printers = no
        disable spoolss = yes
        cups options = raw

;       printcap name = /etc/printcap
        # obtain a list of printers automatically on UNIX System V systems:
;       printcap name = lpstat
;       printing = cups

# --------------------------- File System Options ---------------------------
#
# The options in this section can be un-commented if the file system supports
# extended attributes, and those attributes are enabled (usually via the
# "user_xattr" mount option). These options allow the administrator to specify
# that DOS attributes are stored in extended attributes and also make sure that
# Samba does not change the permission bits.
#
# Note: These options can be used on a per-share basis. Setting them globally
# (in the [global] section) makes them the default for all shares.

;       map archive = no
;       map hidden = no
;       map read only = no
;       map system = no
;       store dos attributes = yes


#============================ Share Definitions ==============================

[homes]
        comment = Home Directories
        path = %H/samba
        browseable = no
        writable = yes
;       valid users = %S
;       valid users = MYDOMAIN\%S

[printers]
        comment = All Printers
        path = /var/spool/samba
        browseable = no
        guest ok = no
        writable = no
        printable = yes

# Un-comment the following and create the netlogon directory for Domain Logons:
;       [netlogon]
;       comment = Network Logon Service
;       path = /var/lib/samba/netlogon
;       guest ok = yes
;       writable = no
;       share modes = no

# Un-comment the following to provide a specific roving profile share.
# The default is to use the user's home directory:
;       [Profiles]
;       path = /var/lib/samba/profiles
;       browseable = no
;       guest ok = yes

# A publicly accessible directory that is read only, except for users in the
# "staff" group (which have write permissions):
;       [public]
;       comment = Public Stuff
;       path = /home/samba
;       public = yes
;       writable = yes
;       printable = no
;       write list = +staff
[share]
comment = Public Stuff
path = /mnt/disk1/share
browsable = yes
printable = no
writable = yes
guest ok = Yes
force create mode = 777
force directory mode = 777
#public = yes
#writable = yes
#only guest = yes

元々の玄箱PRO のsmb.conf は説明文の省略された単純な構成になっておりましたが、上記が本来の姿だと思います。
(どちらでも構わないですが)
動いている状態のままで最適化をしておりませんので、不要な記載をしている部分やおかしな記載もあるかと思います。
[global] に記載してある printing = bsd は、Samba のログファイルの CUPS のエラー表示を行わないようにするためのものです。

[root@meckk ~]# /etc/rc.d/init.d/smb restart
SMB サービスを停止中:                                      [  OK  ]
SMB サービスを起動中:                                      [  OK  ]
[root@meckk ~]# /etc/rc.d/init.d/nmb restart
NMB サービスを停止中:                                      [  OK  ]
NMB サービスを起動中:                                      [  OK  ]
[root@meckk ~]# chkconfig smb on
[root@meckk ~]# chkconfig nmb on
[root@meckk ~]# chkconfig --list smb
smb             0:off   1:off   2:on    3:on    4:on    5:on    6:off
[root@meckk ~]# chkconfig --list nmb
nmb             0:off   1:off   2:on    3:on    4:on    5:on    6:off
[root@meckk ~]#

私の場合は、これで Samba の起動は出来るようになりましたが、nmb が一時起動できなくなったりしてあせりました。
nmb については、どこかをいじった記憶は無いのですが、その後は起動できるようになりました。

実は、これでも結局は動作させる事が出来なくてあきらめていたのですが、別のサーバーを停止させたら動作していた事が確認できたのです。
別のサーバーとは、玄箱HGで構築したFedora12 なのですが、これにもファイルサーバーを構築して常時動作させておりました。
以前にも Samba を2台同時に動作させると片方しか表示しないのは理解しておりましたが、その場合は server string も同じにしておりましたので当然だと思っていたのですが、今回は変えてあるので大丈夫だと思っていたのです。

ひょっとしたら、最初から問題なく動作していたのかも知れません。
どうやら私の場合は、回り道をしてしまった感が強いです。

【注記】
/mnt/disk1/ に share と言うディレクトリィを作成して、パーミッションを 777 にしてください。
この設定では、Windows から share フォルダ見えて、誰でも自由にファイルの出し入れが出来ます。
他のサイトに,Windows から見えない場合の対処方法の書き込みがありましたので、転記しておきます。

何故かWindowsから見えなくなってしまった。
smb.confを見て、怪しそうなものをコメントアウトしてみたが、ダメで、仕方ないのでネット上から動きそうなsmb.confをいくつか拾ってきて試してみたら、動くものがあった。
それをもともとのconfファイルと比較してみていろいろやってみたら、
[global]セクションに netbios name = [おなまえ]を追加すればいいことに・・・
[おなまえ]は、サーバー名と同一ではダメで、例えば、サーバー名がserverならば、natbios name = server-samba などとしてみる。
これでなんとかうまくいきました。