| Word | Description |
| Ymodem | A protocol for transferring files during direct dial-up communications. It is so named because it builds on the earlier Xmodem protocol. Ymodem sends data in 1,024-byte blocks and is consequently faster than Xmodem; however, it doesn’t work well on noisy phone lines. Ymodem has undergone a few enhancements: Ymodem-Batch can send several files in one session, and Ymodem-G drops software error-correction, which speeds up the process by removing the overhead used by error-correction. This works because all modems since the V.32 era have error-correction built into the hardware. |
| Yobibyte | A yobibyte is a unit of data storage that equals 2 to the 80th power, or 1,208,925,819,614,629,174,706,176 bytes. While a yottabyte can be estimated as 10^24 or 1,000,000,000,000,000,000,000,000 bytes, a yobibyte is exactly 1,208,925,819,614,629,174,706,176 bytes. This is to avoid the ambiguity associated with the size of yottabytes. A yobibyte is 1,024 zebibytes and is the largest unit of measurement. |
| Yottabyte | Unit of storage. Often abbreviated to YB. 1 yottabyte (YB) = 2 to the eitheth power (280) bytes = 1,208,925,819,614,629,174,706,176 bytes = 1024 zettabytes = 250 gigabytes = 260 megabytes. |
