SDSSDP-064G data dissapearing

Bought 10 pcs of SDSSDP-064G SSDs off eBay 3mnts ago, left it on the shelf and today tried to partition it.
As long as SSD has the power everything is ok, when you disconnect it an reconnect , everything dissapear like from RAM.
any suggestios? cant find anything with google. All 10 drives the same fault - tested on 4 PCs, through SATA to USB and directly as well. Any help appreciated.