Simple UEFI Questions

The UEFI, as a rule, is kept on the hard drive isn't it? so if the hard drive dies and you replace the hard drive how do you get the UEFI back?

I am assuming even the hard drive partition parameters are kept in the UEFI because I took the hard drive out of a UEFI computer and put it in as a second drive in a non-UEFI computer. The partitions and the data on those partition wasn't recognizable. Doesn't that make it a little tougher to get data off a hard drive?

Is this whole UEFI thing just a little annoying or is it me?
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LockDown32OwnerAsked:
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Lee W, MVPTechnology and Business Process AdvisorCommented:
UEFI is NOT on the hard drive but it does affect the type of hard drive partitioning done.  UEFI replaces BIOS  (BIOS is 35 years old (or older) and UEFI is a new standard that's getting rid of a lot of the old BIOS legacy stuff and adding capability.

The reason your disk had issues is likely that it was initialized as a GPT disk and BIOS systems don't directly support GPT disks, only MBR.

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LockDown32OwnerAuthor Commented:
That was understanding that UEFI was to replace older BIOS but it isn't a file or something on the hard drive? It is actually on a EPROM just like the BIOS? on the motherboard? The hard drive has nothing to do with it?
Lee W, MVPTechnology and Business Process AdvisorCommented:
Yes, it's on the motherboard the same way BIOS was.

https://en.wikipedia.org/wiki/Unified_Extensible_Firmware_Interface
nobusCommented:
>>   I took the hard drive out of a UEFI computer and put it in as a second drive in a non-UEFI computer. The partitions and the data on those partition wasn't recognizable.   <<   this has nothing to do with UEFI - or BIOS

it means that it does not recognise the drive or partitions, probably because the disk is failing. - you can check in the bios - or uefi - if it lists your problem drive correct

if you need the data still, your only option is a a recovery service, like gillware:
http://www.gillware.com/
noxchoGlobal Support CoordinatorCommented:
UEFI is a BIOS feature. On the HDD has only a compatible formatting like GPT.
Depending on the computer to which you connected this drive with GPT formatting style - it can be supporting such drive or not. Usually all current Windows OS version do support GPT drives.
As you connect this drive to another system were the partitions marked Unknown or as RAW? This is important.
Because if they were Unknown you could right click on the partition - assign drive letter and Windows would see them.
If they were RAW then the problem is in MFT & MBR corruption.
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