AL ICT | Operating Systems Day 05 | Disk Allocation Methods + External Fragmentation

A/L ICT Operating Systems – Day 05 In this lesson, we dive deep into Disk Allocation Methods and External Fragmentation, two critical concepts for exams and real-world system design. What you will learn: Contiguous Allocation (advantages, limitations, fragmentation issue) Linked Allocation (structure, pointers, reliability) Indexed Allocation (index blocks, efficiency, scalability) External Fragmentation (what it is, why it happens, how to solve it) Real-world comparison with modern storage systems (HDD vs SSD) This lesson is designed with: ✔ Exam-focused theory ✔ Past paper insights ✔ Clear diagrams & step-by-step explanations Why this lesson is important: Disk allocation directly affects performance, storage efficiency, and system speed. Understanding fragmentation is key to answering structured and MCQ questions in A/L ICT. ලංකාවේ වැඩිම A B සමග, ලංකාවේ විශාලතම තොරතුරු තාක්ෂණ පන්තිය Telegram Group Links : 2026 AL - https://t.me/ictfromabc2026academics 2027 AL - https://t.me/ictfromabc2027 2028 AL - https://t.me/ictfromabc28 OL students - https://t.me/ictfromabc_ol Whatsapp Channel Links : AL - https://whatsapp.com/channel/0029Vb5C... OL - https://whatsapp.com/channel/0029Vb1Q... සියලුම online පන්ති වලට සහභාගී විය යුත්තේ අපගේ වෙබ් අඩවිය හරහාය https://www.ictfromabc.com සක්යා - නුගේගොඩ නැණික් - ගම්පහ සිප්වින් - කුරුණෑගල යහන්සා - කිරිබත්ගොඩ IMS - මහනුවර භෞතික පන්ති පැවැත්වෙන්නේ උසස් පෙළ සඳහා පමණි. සාමාන්‍ය පෙළ සඳහා Online පන්ති සහ විභාගය ආසන්නයේ භෞතික සම්මන්ත්‍රණ පැවැත්වේ. #ALICT #ICTSriLanka #OperatingSystems #DiskAllocation #ExternalFragmentation #AL2026 #ALICT2026 #ICTfromABC #RavinduBandaranayake #ALICTLessons #SriLankaEducation #TechEducation #ComputerScience #ICTClass #ALICTSinhala