# What happens to my blockchain download if there is a sudden ISP outage?

I've been downloading the blockchain using Geth --rpc so that my computer can mine ethereum, however it's been downloading for 3 days and is at roughly 23GB's in size (yesterday it was 25GB's). Though I was curious what would happen to the blockchain I've already downloaded, if my internet experienced an outage before the blockchain completed?

I assume it would simply keep trying until the connection resumed, but this is new to me. If I may also ask, what is the current size of the blockchain? I don't mind the wait, I would just like an idea of where I'm at, if it's around 80% done, 50% done, or what. :)

Also if it helps my ISP speed is 50MB's download, my computer has 16GB's RAM, i5-3570K CPU, 1080TI FTW GPU, Windows 10Pro, and about 200GB's of free space on the hard drive.

Please let me know.

Thank you!

• Is your disk SSD? Using --syncmode fast over an SSD disk should download the blockchain in less than a day, a couple of hours with a fast internet connection. Entering web3.eth.syncing in the geth console will show the current progress, most recent block is 3966826, as of 2017-07-03 07:38 GMT. – Ismael Jul 3 '17 at 7:38
• Concerning the blockchain size check ethereum.stackexchange.com/questions/143/… – Badr Bellaj Jul 3 '17 at 13:17
• Thank you BadrBellaj. My hard drive is just a SATA. I'll keep note of the web3.eth.syncing. Once the download finishes I need to find a program to work with Geth, that will make it easier to understand everything I'm looking at. Hopefully in GUI interface. Any recommendations? – MScifiwriter Jul 4 '17 at 17:36

## 1 Answer

It will continue downloading from where you left off. You can also stop the app and open it again and it'll continue downloading from where it left off.

Without the --light flag in Geth, the blockchain size will be about 60 GB so you're almost halfway there since it looks like you didn't use that flag.

• Thank you JaTochNietDan! I didn't know about the --light flag or really any shortcuts. I suppose I could stop it and re-start it with the flag, to make it faster but would that interfere with mining afterward? I'm hesitant to do anything that might mess it up. I started the process based a guide that I found huffingtonpost.com/entry/… By any chance is there a site with an beginners guide to mining or at least a list of flags? Also, is there a GUI interface available for this? Just thought I'd ask. Thank you. – MScifiwriter Jul 4 '17 at 17:31