This page is based on advice given by BECTa to UK schools several years ago: It is, however, just as relevant now, as almost all computer CD/DVD drives are now “high speed”. Wordshark and Numbershark disks are produced to normal industry standards, and like any CD they will give years of service if treated carefully. Being scratched or bent can reduce their life - and as you will read below, could potentially cause them to shatter. If using a fast drive, please check any CD for cracks around the spindle hole before loading. Any CD with such damage must not be used, as it could shatter. As well as visual checks, be alert to any disk that rotates with more vibration/noise than is normal for your drive, as this puts great stress on the CD (which may shatter) and on the drive (which may vibrate and wear rapidly) Using a damaged CD will often destroy the CD drive, either through excessive wear or when the CD shatters. More seriously, in a few instances (not, so far, involving Wordshark or Numbershark) sharp plastic shards have been ejected at speed through the front cover, with potential for injury to anyone sitting nearby. Cracking round the centre spindle hole can occur if a CD is bent (for example whilst removing or inserting into the drive or CD case): Our CD cases hold the CD in place with centre buttons marked “Press” - failure to press will increase stress on the CD as it is taken out of the case. This is not a manufacturing defect. Our sales department and overseas distributors can exchange damaged disks (even shattered ones!) for a small administration charge. Details UK national advice to schools (from now closed BECTa) is that it is recommended that any CD / DVD drives running at x24 or faster should have a warning sign alerting users to the risks of these fast drives, and specifically the need to check for spindle hole cracks. In common with other software companies, White Space Ltd does not accept liability for injury, or for damage caused by shattered disks.