日立冷氣-型號比較

• 一對多室外機

室外機之冷氣能力		5.0 kW	6.3 kW	7.2 kW	8.4 kW	9.0 kW	10.0 kW	13.0 kW
冷暖型 (NK/NB系列)	1對2	RAM-50NK	RAM-63NK	RAM-71NK	RAM-83NK	RAM-93NK	RAM-108NK	RAM-130NK
	1對3	--	--	--	RAM-86NK	RAM-93NK	RAM-108NK	RAM-130NK
	1對4	--	--	--	--	--	RAM-108NK	RAM-130NK
冷專型 (JK/JB系列)	1對2	RAM-50JK	RAM-63JK	RAM-71JK	RAM-83JK	RAM-93JK	RAM-108JK	RAM-130JK
	1對3	--	--	--	RAM-86JK	RAM-93JK	RAM-108JK	RAM-130JK
	1對4	--	--	--	--	--	RAM-108JK	RAM-130JK

• 以RAM-50NK為例，能搭配
• RAS-28NK+RAS-28NK
• RAS-28NK+RAS-22NK
• RAS-22NK+RAS-22NK
• 以相加不離50太遠為準

• 以RAM-93NK為例，能支援到一對四，搭配選項就很多。
• RAS-36NK+RAS-63NK
• RAS-28NK+RAS-71NK
• RAS-28NK+RAS-28NK+RAS-28NK
• RAS-22NK+RAS-22NK+RAS-22NK+RAS-22NK
• 以相加不離93太遠為準

• 室內機(RAS-XXNK/RAS-XXHK) XX代表
• 22 : 3-4坪
• 28 : 4-5坪
• 36 : 5-6坪
• 50 : 7-9坪
• 63 : 9-11坪
• 71 : 10-12坪

• NK頂級系列與HK旗艦系列差別在於省電
• RAC-28HK
• 

• RAC-28NK
• 
• 大致上頂級比旗艦系列貴一成，省電也差一成

資料來源

• http://www.taiwan-hitachi.com.tw/products/products_level3.aspx?A30045944CBA3BA2

The NTFS partition is in an unsafe state. Please resume and shutdown

root@OpenWRT:~# mount /dev/sdb2 /mnt/sdb2

Windows is hibernated, refused to mount.

Failed to mount '/dev/sdb1': Operation not permitted

The NTFS partition is in an unsafe state. Please resume and shutdown

Windows fully (no hibernation or fast restarting), or mount the volume

read-only with the 'ro' mount option.

解法：

root@OpenWRT:~# ntfsfix /dev/sdb2

Mounting volume... The disk contains an unclean file system (0, 0).

Metadata kept in Windows cache, refused to mount.

FAILED

Attempting to correct errors... 

Processing $MFT and $MFTMirr...

Reading $MFT... OK

Reading $MFTMirr... OK

Comparing $MFTMirr to $MFT... OK

Processing of $MFT and $MFTMirr completed successfully.

Setting required flags on partition... OK

Going to empty the journal ($LogFile)... OK

Checking the alternate boot sector... OK

NTFS volume version is 3.1.

NTFS partition /dev/sdb2 was processed successfully.

Intel® H110 V.S. Intel® B250 晶片組

都支援內建影像輸出，大概上差不多主要差異在於

• 推出日期 
• H110 : 2015 Q3 
• B250 : 2017 Q1 

• 匯流排速度 
• H110 : 5 GT/s DMI2 
• B250 : 8 GT/s DMI3 

• USB規格 
• H110 : USB3.0*4 USB2.0*10 
• B250 : USB3.0*6 USB2.0*1 

• PCI-E規格 
• H110 : PCIe3.0*12 
• B250 : PCIe2.0*6

參考連結:
https://ark.intel.com/zh-tw/products/98086/Intel-B250-Chipset
https://ark.intel.com/zh-tw/products/90590/Intel-H110-Chipset

Linux PID 何時會開始重複使用

重複fork & kill process 拿到的pid會越來越大

直到何時？可以由cat /proc/sys/kernel/pid_max 指令知道max pid

超過後就開始重複使用啦ＸＤＤ

root@xxxx:/root# cat /proc/sys/kernel/pid_max

32768

[3C] 4G WiFi分享器

目標: 4G wifi 分享器，同時支援越多裝置連線越好

大部份小型wifi router大多只能支援10個client，只有找到以下兩個可以支援32個client


1. HUAWEI 華為 B315 4G-LTE 行動網路 WiFi分享 無線路由器

2. ZYXEL WAH7706 LTE 行動路由器

基本上兩台差不多，最大差別在於

B315下載最高150Mbps，WAH7706最高300Mbps

device tree dtb dts轉換

DTS to  DTB:

./scripts/dtc/dtc -I dts -O dtb -o <devicetree name>.dtb <devicetree name>.dts

DTB back into a DTS:

./scripts/dtc/dtc -I dtb -O dts -o <devicetree name>.dts <devicetree name>.dtb

知名度PK : discuz VS phpbb

在台灣 discuz > phpbb

• https://www.google.com.tw/trends/explore?date=all&geo=TW&q=discuz,phpbb
• https://www.google.com.tw/trends/explore?date=today%2012-m&geo=TW&q=discuz,phpbb

在中國 discuz > phpbb

• https://www.google.com.tw/trends/explore?date=all&geo=CN&q=discuz,phpbb

在美國 phpbb >>> discuz

• https://www.google.com.tw/trends/explore?date=all&geo=US&q=discuz,phpbb
• https://www.google.com.tw/trends/explore?date=today%2012-m&geo=US&q=discuz,phpbb

在全球 phpbb >>> discuz

• https://www.google.com.tw/trends/explore?date=today%2012-m&q=discuz,phpbb

台灣各大論壇後台使用狀況

discuz:

• http://ck101.com/
• http://www24.eyny.com/index.php
• https://www.htcvive.com/tw/forum/chat.php?type=general
• http://www.tt1069.com/bbs/forum.php?
• http://www.piring.com/bbs/tcn/
• http://oursogo.com/
• http://taiwan-city.com/forum.php
• http://www.centurys.net/
• http://catdu.com/forumdisplay.php?fid=6&page=1

phpbb:

• http://www.news100.com.tw/