我的mac pro是2012年初買的，4G/500G HDD在服役了六年多后速度堪比老牛，以前裝的虛擬機壓根不敢打開。這幾天把內存更換為8G，硬盤升級為samsung的1T SSD，感覺像起死回生一樣。預留此文，准備把更換過程記錄一下。
1. 更換內存，Amazon上按照好評度和性價比買來匹配2011 late mac pro的內存雙條裝，4G*2
Crucial 8GB Kit (4GBx2) DDR3/DDR3L 1333 MT/s (PC3-10600) SODIMM 204-Pin Memory For Mac - CT2K4G3S1339M。
此處需要注意的是，打開后蓋后的螺絲最好按照當初位置擺好，硬件更換完畢后再原樣裝回去。雖然有些螺絲長得差不多，但一旦換個位置裝卻往往不能完全裝進去，突出一塊：（
2. 選擇一個足夠大的移動硬盤，用time machine備份當前macOS，我備份了好幾個小時，400G+
3. 制作macos的U盤啟動盤，直接去apple官網查guide如下：
Download macOS from the App Store
- Download macOS from the App Store. To download, use a Mac that is compatible with the version of macOS you're downloading.
If you're downloading macOS High Sierra, use a Mac with High Sierra, Sierra 10.12.5 or later, or El Capitan 10.11.6. Enterprise administrators: Please download from Apple, not a locally hosted software-update server. - When the macOS installer opens, quit it without continuing installation.
- Find the installer in your Applications folder as a single ”Install” file, such as Install macOS High Sierra.
Use the 'createinstallmedia' command in Terminal
- After downloading the installer, connect your Mac to the USB flash drive or other volume that will be used as the bootable installer. Make sure that it has at least 12GB of available storage.
- Open Terminal, which is in the Utilities folder of your Applications folder.
- Type or paste one of the following commands in Terminal. These assume that the installer is still in your Applications folder, and the name of your volume is MyVolume. If it's named differently, replace MyVolume accordingly.
High Sierra:
sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume --applicationpath /Applications/Install\ macOS\ High\ Sierra.app
- Press Return after typing the command.
- When prompted, type your administrator password and press Return again. Terminal doesn't show any characters as you type your password.
- When prompted, type
Yto confirm that you want to erase the volume, then press Return. Terminal shows the progress as the bootable installer is created. - Quit Terminal when done.
有個帖子寫的很具體，見https://www.jianshu.com/p/2ff576583361，只不過我當前系統是high sierra，而鏈接中的是EI Capitan。回頭再把此帖子轉過來。
4. Amazon上買來專用螺絲刀，拆除舊硬盤，安裝新硬盤。
5. 用U盤啟動，此處引用官方guide：
Use the bootable installer
- Connect the volume containing the bootable installer to a compatible Mac，由於我已經備份了當前系統，就把備份用的移動硬盤也連接在電腦上
- Use Startup Disk preferences or Startup Manager to select that volume as the startup disk. Learn about selecting a startup disk, including what to do if your Mac doesn't start up from it.
- Your Mac then starts up directly to the macOS installer. Follow the onscreen instructions to install macOS
- 另外，先用“磁盤工具”將新硬盤格式化
- 另外，我在安裝時選擇了“從time machine備份進行恢復”，並選擇之前備份用的移動硬盤，由於備份太大，安裝經歷了好幾個小時。這里奇怪的是，我第一次安裝失敗了，不知是何原因，后來我同樣操作了一遍又安裝成功了。在第一遍安裝還差半小時完成時，我在娃的召喚下去睡覺了，半夜爬起來發現居然死機了。於是又重新U盤boot起來，同樣的步驟選擇一遍“從time machine備份進行恢復”，第二天早晨起床時又發現安裝成功了。
安裝完畢后，登錄進電腦，系統還是那個系統，但是速度嗖嗖嗖嗖嗖嗖：）