ESXi usb vs sd

I have a HP Proliant DL380 Gen8, that I will use for vsphere essentials. The server comes with an internal USB and SD. I am going to boot from one of them but I am not sure which one I should use. What are the pros and cons of each?
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Both are flash technology, if it concerns you of how quickly the server reads the files at BOOT before it goes memory resident, SD card technology maybe faster than USB sticks, but that depends on how quickly the USB and SD card ports are internally to read the data.

USB Flash Drives are easier to repair, because most PCs have a USB socket, you would need an SD card reader to fix on a PC, unless you have a laptop with an SD card slot.

I do not think there are advantages or USB or SD card, Dell Servers were use SD cards, because they have mirrored SD card slots for embedded installations.

On HP installations we use USB or SD cards, which ever is available.

What I do recommend, is you use a good quality, HP, Kingston, Lexmar, SanDisk, or the vendors part number.

Here is the VMware KB on installing 5.x on USB/SD:
SD cards are usually more elegant, as nothing protrudes out of the server, and you can't break them off mechanically by brushing past them. But since you have internal ports for both SD cards and USB sticks, that shouldn't be an issue.
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