<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><span class="Apple-style-span" style="font-family: 'Lucida Grande', Geneva, Arial, Verdana, sans-serif; color: rgb(51, 51, 51); font-size: 12px; line-height: 18px; "><div class="attr INTRODUCTION" style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 15px; padding-left: 0px; "><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 18px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; "><a href="http://support.apple.com/kb/HT2300">http://support.apple.com/kb/HT2300</a></p><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 18px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; ">They're pronounced the same, but, technically speaking, there is a distinct difference between a disc and a disk.</p></div><div class="affected" style="margin-top: 0px; margin-right: 0px; margin-bottom: 15px; margin-left: 0px; padding-top: 10px; padding-right: 0px; padding-bottom: 10px; padding-left: 0px; border-top-width: 1px; border-top-style: solid; border-top-color: rgb(232, 232, 232); border-bottom-width: 1px; border-bottom-style: solid; border-bottom-color: rgb(232, 232, 232); color: rgb(136, 136, 136); "><h2 style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; font-size: 12px; font-weight: bold; font-style: normal; line-height: 18px; color: rgb(136, 136, 136); "></h2><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; ">Mac OS</div></div><div class="attr HOW_TO" style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 15px; padding-left: 0px; "><h4 style="margin-top: 0px; margin-right: 0px; margin-bottom: 4px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; font-size: 14px; font-weight: bold; font-style: normal; line-height: 18px; ">Discs</h4><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 18px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; ">A disc refers to optical media, such as an audio CD, CD-ROM, DVD-ROM, DVD-RAM, or DVD-Video disc. Some discs are read-only (ROM), others allow you to <a href="http://docs.info.apple.com/article.html?path=Mac/10.5/en/11408.html" onclick="s_objectID="http://docs.info.apple.com/article.html?path=Mac/10.5/en/11408.html_1";return this.s_oc?this.s_oc(e):true" style="color: rgb(41, 113, 167); text-decoration: none; ">burn content</a> (write files) to the disc once (such as a CD-R or DVD-R, unless you do a <a href="http://docs.info.apple.com/article.html?path=Mac/10.5/en/8647.html" onclick="s_objectID="http://docs.info.apple.com/article.html?path=Mac/10.5/en/8647.html_1";return this.s_oc?this.s_oc(e):true" style="color: rgb(41, 113, 167); text-decoration: none; ">multisession</a> burn), and some can be erased and rewritten over many times (such as CD-RW, DVD-RW, and DVD-RAM discs).</p><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 18px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; ">All discs are removable, meaning when you unmount or eject the disc from your desktop or Finder, it physically comes out of your computer.</p><h4 style="margin-top: 0px; margin-right: 0px; margin-bottom: 4px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; font-size: 14px; font-weight: bold; font-style: normal; line-height: 18px; ">Disks</h4><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 18px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; ">A disk refers to magnetic media, such as a floppy disk, the disk in your computer's hard drive, an external hard drive. Disks are always rewritable unless intentionally locked or write-protected. You can easily <a href="http://docs.info.apple.com/article.html?path=Mac/10.5/en/8494.html" onclick="s_objectID="http://docs.info.apple.com/article.html?path=Mac/10.5/en/8494.html_1";return this.s_oc?this.s_oc(e):true" style="color: rgb(41, 113, 167); text-decoration: none; ">partition</a> a disk into several smaller volumes, too.</p><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 18px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; ">Disks are usually sealed inside a metal or plastic casing (often, a disk and its enclosing mechanism are collectively known as a "hard drive").</p></div></span></body></html>