1. 谷歌云端硬盘：
Google Drive 是 Google 提供的文件存储和同步服务。它允许用户存储文件和个人数据并共享文件。它提供 15 GB 的免费存储空间。它由 Google 于 2012 年推出。几乎每个与互联网有关的人都在使用它。每个人都用它来存储一些专业和个人数据。
2.乌拉：
Wuala 是一种文件同步服务、文件存储服务、文件版本控制服务和备份存储服务，最初由 Caleido Incorporation 提供，但后来归希捷科技所有。它是由Dominik Grolimund和Luzius Meisserin 开发的。它主要是使用Java开发的。它提供了 5 GB 的免费存储空间。它于2008年推出。
Google Drive 和 Wuala 的区别：
| GOOGLE DRIVE | WUALA |
|---|---|
| It is owned by Google LLC. | Originally owned by Caleido Incorporation but was later owned by Seagate Technology. |
| It was launched in 2012. | It was launched in 2008. |
| It offers 15 GB free storage space. | It offered 5 GB free storage space. |
| It was developed by Google. | It was developed by Dominik Grolimund and Luzius Meisserin. |
| It does not have referral system for gaining additional free storage space. | Initially it had referral system but later on referral service was suspended. |
| It has the maximum storage size of 30 TB. | Maximum storage size offered was 2 TB. |
| It supports file versioning. | It also supported file versioning. |
| It does not provide ability to trade local disk storage space. | It provided ability to trade local disk storage space against cloud storage. |
| It provides full security of data. | It provided less security of data than Google drive. |
| It is still in use. | This service was suspended in 2015. |