partially disabled or knocked out popular websites including Quora, Foursquare and Reddit.

On Saturday, two days after Amazon suffered , the company announced that it had fixed most of the problem. However, the latest update on Amazon's Service Health Dashboard noted that engineers are still working on some remaining issues with its EBS, or Elastic Block .

At 10:35 p.m. ET on Sunday, reported, "We're in the process of contacting a limited number of customers who have EBS volumes that have not yet recovered and will continue to work hard on restoring these remaining volumes.

Users still having problems with their hosted Web sites should contact Amazon on their . Users should select Amazon Elastic Compute in the "Services" field. And in the description field, they should list the instance and volume IDs and describe the issue they're experiencing.

The company also noted on its dashboard that workers are "digging deeply into the root causes of this event" and will post their findings in a post mortem.