What that does:
if one byte is available, read 93 bytes and write to EEPROM. So if you e.g. send the character 'a' as the first byte, it will write 'a' in the first EEPROM cell and 92 times -1(0xFF).
Further the serial buffer in the arduino is limited to 64 (might be 63, not sure) bytes; if you send more without reading it in time, a buffer overflow will occur. Please have a look at Robin's Serial Input Basics - updated how to reliably read data; if you want to receive more than 32 bytes, you have to adjust const byte numChars = 32;.
Note:
Please post in English; use google translate if needed.