Here is a little excerpt of my conversation with Siteground. As you can see they really try to dodge my questions about how much space a server really has.

You are now speaking with Maria of Sales Department.Maria: Hello JC

Maria: Welcome to SiteGround.com Hosting Services!

JC: Hello Maria.

Maria:

JC: Can you tell me how long you have been in business?

Maria: SiteGround has been in this business since 2003 and we have been expanding it thanks to the incomparable quality of services we provide.

Maria: Also, we have proved ourselves by some of the awards you can see here if you like:

Maria: http://www.siteground.com/about_us.htm

JC: Do you allow overselling on the reseller accounts?

Maria: Could you please hold on a second so that I can transfer you to one of our experienced senior sales assistants for better assistance

Maria: do you mind, please?

JC: Ok

Please hold while being transferred to Valentin of Senior Sales Department.

You are now speaking with Valentin of Senior Sales Department.

Valentin: Hello JC

Valentin: Could you please allow me a second to review the conversation above

JC: Hello Valentin.

JC: Sure

Valentin: Could you please elaborate a little bit for better assistance?

JC: Well, you know how you offer 750 Gigs of webspace?

JC: For your reseller plan.

JC: Can I really use all 750 Gigs?

Valentin: Overselling is a situation when the company cannot deliver the resources it advertises, which is not our case. At SiteGround, every customer gets as much resources as they have paid for. Our system administrators have introduced innovative technologies to balance and optimize the load on our servers so that every customer gets the resources they paid for. You will be able to use 750,000MB space, 7500GB traffic, and all else any time you need those.

JC: May I ask then how many customers do you have roughly on a Reseller server?

Valentin: Well our techs are always balancing our servers and on each server there is a different number of customers so that the server is on its best performance.

JC: Ok, so lets say you had just 25 resellers on one server. Do you have any idea how much disk space that is? Thats more than your server can probably handle wouldn’t you say?

Valentin: if you need that much disk space, you are welcome to use the 750GB disk space for each account that you are going to open.

JC: So you are basically telling me that this space is on the server and available for multiple resellers?

Valentin: This space if for each account that you are going to open.

Valentin: If you have with your reseller plan 5 account, each of them will have 750GB disk space.

JC: Ok. So if I were to open a few accounts you are telling me that you have a server that has terabytes of diskspace just sitting there?

Valentin: That is correct, You will be able to use 750,000MB space, 7500GB traffic for each account that you have.

JC: Wow!! Thats amazing. Do you know thats called overselling if you really don’t have it? Its amazing how you will tell me it is available. But the real truth is, that if I were to use it all I would run into a possible two problems. Either system resources or I would go over the Inode limit. I am sorry but I believe that you are not being truthful with me.

Valentin: May I ask what type of websites you are planning to build>

Valentin: ?

JC: They will be blogs. About 2500 of them actually. Updated each and every day by many people.

Valentin: Hosting so many blogs, I would personally advise you to consider a dedicated solution.

JC: I will not need that though since I will have plenty of diskspace and bandwidth that you provide.

Valentin: We basically the disk space and the traffic aren’t the most critical factor for hosting so much websites which will be viewed and updated by many visitors

Valentin: They will require a lot of server resources.

JC: And that is my point Valentin. That is the catch to giving all that Diskspace and bandwidth. Am I correct on that?

Valentin: On a shared hosting server you will be able to host quite big websites smoothly, however for such a number a dedicated servers is the perfect choice.

Valentin: I would recommend you a dedicated server for so many and that big as you specified websites.

Valentin: http://www.siteground.com/dedicated_servers.htm

JC: I would like to ask a direct question and get a direct answer if thats ok. How much diskspace does the reseller server have in total?

Valentin: Each account has 750GB disk space, sir.

Valentin: you are welcome to use them

Valentin: Big that big site will require a lot server resource.

JC: I understand. All I wanted to know is what the server itself held in total.

JC: May I ask why the highest end server only has 500 gigs available? Thats less than a reseller plan.

Valentin: With the dedicated server you will the whole server resource just for you. The server resources are very important with hosting heavy websites as youtube etc..

JC: Ok. Thanks Valentin. I appreciate all your help.

JC: Have a great evening.

Valentin: You are most welcome, JC.