I am working with bunch of uSD card. The place where i work is not ESD protected so i am just concerned if these devices can get damaged by the discharged current. Can someone help ?
SD cards may carry static voltages, but are not damaged by them; Flash memory devices are made to be resilient to the potential spikes they encounter on a daily basis. Otherwise, they would never have caught on in cameras and phones.
The charges cards carry may pose a threat to the devices they interface with; TI discusses voltage clamping and EMI filters for device interfaces. EMI filters are preferred for SD card interfaces due to their small size.
Of course, you may be in a more professional setting with less common risks, but as long as you are not running Tesla coils or opening up the cards, no extra ESD precautions seem necessary. If the information on the cards is remotely valuable, back it up, because no practical amount of ESD will protect against the sorts of accidents that are likely.