After first time boot into Mac, i reboot and then my boot drive disappeared
While Installing a new OS X or macOS system, it is a good idea to REMOVE from the Motherboard, the connections to other System Disks from the SATA ports leaving just the target disk for installation and similarly remove all devices from the USB ports except the Installer.
If you have a Windows disk already connected and then try to install Hackintosh, Windows bootloader can corrupt Clover and kill the Hackintosh installation.
What can you do at this stage?
Shut down the System.
Disconnect Power cable from the Case
Enter the Case and disconnect either the POWER or SATA data cable from all the other disks except the one for macOS High Sierra.
While inside the case, under proper electrostatic precautions, Clear CMOS
Reconnect Power Cable.
Power ON and choose "Load Optimized Default BIOS and Reboot" from the boot screen
On reboot, press the hotkey to enter "BIOS setup"
Re-enter all required options in the BIOS menu for macOS Booting.
Make sure Year|Month|Date and Time are current
Make your UEFI USB Installer as First boot device and Save Setup changes (F10) and boot.
Press Hot key for Boot Menu and choose your USB installer to enter CLOVER Boot Manager Screen.
Go to Options>Boot Args: and make sure correct Flags including Verbose boot flag -v are there.
Return to Boot Screen and select and boot your
MacOS High Sierra SYSTEM DISK
Hopefully you will be able to complete the installation and install CLOVER , Kexts and System definition on the new HighSierra for it to boot the next time again with USB Installer's help
Finally you can edit config.plist of the System disk to make it boot without USB Installer help
Once the New system is up to-date, shut down and connect the others sytems
On reboot go to BIOS setup and make MacOS Disk as First Boot so that CLOVER will be the controlling Boot loader.
Save the BIOS setup and boot to Clover Boot Manager screen to choose the system you want