TThe default setting of Transcend SJM series is HFS+, which will only work on MAC OS. We suggest you format your SJM portable hard drive to FAT32, NTFS or exFAT in Windows operating system if you prefer to use SJM portable hard drive (portable SSD) on Windows.
1.Mac OS cannot write data into portable hard drive or portable SSD if your portable hard drive is NTFS.
2.An additional driver is required for SJM300/500 to be detected by Windows 8.1, 8, 7, Vista and Windows XP via Thunderbolt. Please download the driver from: http://www.transcend-info.com/Software/1325/
Install the driver before connecting SJM300/500 to your Windows platform via Thunderbolt.