SSD Machine: Dell XPS 15 (9530) configuration: -CPU i7 - 4702 -RAM 16 GB, LDDR3 - Video Geforce 750M - Hard drive 1TB - SSD 32GB procedure: 1. in BIOS, switch "the Intel Smart Start" to "AHCI" (Advanced Host Controller Interface) 2. boot the machine from USB with Windows 10 64bit home edition, format the 1TB harddrive, make a primary section C: with a size of 127.5 GB (visual ), and install Window 10 on C: of 1TB harddrive 3. remove the bottom cover of the laptop, replace the original 32GB SSD with a Hitachi 128GB SSD (mSATA PCI-E) 4. boot the machine from USB with Windows 10 64bit home edition, install Windows 10 home (64bit) on the 128 GB SSD (119GB visual). Results Space taken: -on the 1TB Hard drive, fresh installation of Windows 10 home takes 29,125, 214,208byte (27.1GB) -on the 128GB SSD, the fresh installation of Windows 10 home takes 18,618, 953,728byte (17.3GB) Boot time - from 1TB harddrive, 1m 15s, 17 - from 128GB SSD, 15s, 22