This is a set of two 3.5-inch HDDs manufactured by Seagate: ST20000DL001 (2TB) and ST20000DM001 (2TB). Please note that these drives do not support AV commands! The power-on count and usage time are as shown in the images. (The power-on count may be 2-3 times higher than shown in the images, depending on the capture timing.) For this listing, the data has been completely erased using data erasure software. Therefore, the drives will not be recognized as such when connected to a PC. Please initialize the disks and create a new simple volume using the OS's "Disk Management" tool. (I intentionally haven't created a volume as proof that the contents have been completely erased.) If you wish, I can create a volume before shipping. Please comment if you'd like me to do so. 【Specifications】 ・Model Name: ST20000DL001-9VT156 ・Capacity: 2TB ・Rotation Speed: 5900rpm ・Cache: 64MB ・Interface: SerialATA 6Gbps 【Specifications】 ・Model Name: ST20000DM001-9YN164 ・Capacity: 2TB ・Rotation Speed: 7200rpm ・Cache: 64MB ・Interface: SerialATA 6Gbps I will answer questions and ship items primarily on weekends, so please be patient.