树莓派4B能带动多个移动硬盘吗

一个500GB西数移动硬盘运行良好，加1个2TB希捷移动硬盘，执行rsync复制时，希捷盘异响，然后出错，无法使用。怀疑是供电不足。

参考此链接：

Re: Can Pi 4 power a 4 TB USB 2.5" HDD?
Wed Nov 25, 2020 4:52 pm

The answer to the original question is "most of the time".

I have that exact hard drive; Western Digital My Passport 4Tb. I have a RPI4, which I have set up for USB boot, and it works fine most of the time. I've not found it to fail on startup. However, when I attempted to copy a large file hierarchy (40Gb) to the drive, eventually there was a loud "clacking" from the unit, and rsync complained of disk errors.

I checked the disk (fsck) & contents (md5sum) on another machine and there was no permanent damage. I have done this style of file copy many many times from/to laptops/desktops on this particular drive, with no problems.

My guess is that when the actuators for the read/write heads get too busy, they draw more current than normal and end up pulling down the supply rail.

For the record, the PSU I use is branded "Vilros" and is claimed to be made specifically for the RPI4; 5.1V @3A. The USB cable connecting the drive is from WD, and I plug it into a USB3 port on the RPI4.

Hope this helps.

https://raspberrypi.stackexchang ... external-usb-3-hdds

If two SSDs are used for professional projects, it is better to supply external power to the USB hub.

https://raspberrypi.stackexchang ... ortable-usb-hdd-ssd

have a spare nintendo switch charger (15V 2.6amp) that I am using and I am trying to copy my system to a mechanical Seagate Backup Plus (4TB). The drive mounts fine, and I can copy files of trivial size back and forth; but when I start rsync, my pi shuts down a few seconds later.

My Answer to the question is yes, you can use an HD with the raspberry pi, but if you aren’t using right charger you will likely have problems.

I wanted to post this as a comment, but I apparently don’t have enough reputation for that...

https://raspberrypi.stackexchang ... ortable-usb-hdd-ssd