I have just found two hidden partitions on my Samsung laptop running Windows 7:
File System Label Size Flags ntfs SYSTEM 100Mb boot %hidden partition 1% %hidden partition 2% ntfs SAMSUNG_REC 21Gb diag
Q1: What are they for?
Q2: Is it safe to delete them?
Q3: Is it ok to format
%hidden partiton x% and reinstall Windows 7 and install Ubuntu after that to have a dual-boot system?