Formatted capacities are generally set in terms of kilobytes and megabytes. Early cartridges were 4 kilobyte ROMs, which grew to 24 kilobytes for later games. The memory was 1,024 words (5.1 kilobytes). This January demo required 512 kilobytes of RAM memory. It has an actual size of 256 kilobytes. Infected disks usually have five kilobytes of bad sectors. A disk block might be 16 kilobytes. It also had split instruction and data caches of 4 kilobytes each. Blowfish has a memory footprint of just over 4 kilobytes of RAM. The 68040, released in 1990, has split instruction and data caches of four kilobytes each. The defragmenter supports NTFS volumes with cluster sizes larger than 4 kilobytes. That computer had a memory of 8 kilobytes. However, the chip is large enough (64 kilobytes) for inclusion of biometric identifiers. It also featured 196 kilobytes of "powerful computer memory". The data was communicated in bursts of 2 kilobytes.