With the usual definition, at least 4.
It is a combination of RAID 1 and RAID 0. It takes at least four disks for RAID 10. Refer to A+ at Ch. 6 pages 258.
I think its called mirroring (it clones the data on 2 drives for raid 1) so you have 2 redundant copies of your data , thus increasing the odds for data recovery if 1 hdd goes that is for raid 1
Raid on Berlin happened in 1760-10.
Raid on Nassau happened in 1703-10.
Even thought there are more than 20 different variants of RAID, they all spawn off of three main technology standards. 1.) Striped (RAID 0) 2.) Mirrored (Raid 1) 3.) Parity (Raid 3,4,5,6) From those three you can create vast complex arrays. For example; RAID 5X5 +1 is what our NAS server has it consists of 50 HDD's where this array combines all three technologies.
RAID 10
Raid on Choiseul happened on 1943-10-28.
The Great Raid was created on 2005-08-10.
Indian Ocean raid happened on 1942-04-10.
St. Albans Raid happened on 1864-10-19.
St. Francis Raid happened on 1759-10-04.
You perform HDD recovery on a laptop computer. There are many steps you have to go through to perform a HDD recovery. There are sites on the Internet that can help walk through the process.