Disk storage uses rotating disks to record data through magnetic, optical, or mechanical changes to the disk surface. A disk drive is a device that implements disk storage. Disk storage capacities have increased through data compression techniques. There are different access methods for disks, including basic sequential access and direct access, as well as different types of disk controllers. Blu-ray discs provide high-density storage through their blue-violet lasers and small wavelengths, allowing for storage capacities up to 500GB. Troubleshooting disk drive issues involves checking for dust, scratches, firmware or hardware problems.

1. DISK STORAGE
15BCE048 15BCE051

2. DISK STORAGE
Disk storage is a general category of storage mechanisms
where data are recorded by various electronic, magnetic,
optical, or mechanical changes to a surface layer of one or
more rotating disks.
A disk drive is a device implementing such a storage
mechanism.
Analog → Digital
First disc → IBM 350 in 1956

3. DISCS can now store
large amounts of data
owing to advancements in
data compression
techniques.

4. ACCESS METHODS
BASIC v/s QUEUED
SEQUENTIAL v/s
DIRECT
Source: theguardian.com

5. BASIC access methods
read or write one physical
record – block – at a time.
BETTER FLEXIBILITY
QUEUED methods
support internal blocking
of data and also often
read-ahead scheme.
BETTER PERFORMANCE

6. SEQUENTIAL
access assumes that
records can be processed
only sequentially,
DIRECT access is
synonymous to random
access.

7. constant angular
velocity

8. DISK CONTROLLER
➔ controller circuit which enables the CPU to
communicate with a hard disk, floppy disk or
other kind of disk drive.
➔ Separate controller cards to inbuilt
➔ Run length limited (RLL) controllers used
data compression to increase storage
capacity by about50%.
➔ PATA (IDE)
➔ Serial ATA
➔ Not to be confused with HOST ADAPTERS

9. Floppy disc controller
Hard disc controller

12. TROUBLESHOOTING
DUST
CHECK ANTI - VIRUS
RESTART

13. TROUBLESHOOTING FDC
WRITE PROTECTED
BAD HARDWARE
CONFLICTS WITH OTHER
HARDWARE
INVALID MEDIA

14. TROUBLESHOOTING HDC
PHYSICAL CONNECTIVITY
VIRUS
CHECK OS SUPPORT
DRIVE ERRORS
FORMATTING

15. BLURAY DISC

16. 1. Apple
2. Dell
3. Hitachi
4. HP
5. JVC
6. LG
7. Mitsubishi
8. Panasonic
9. Pioneer
10. Philips
11. Samsung
12. Sharp
13. Sony
14. TDK
15. Thomson
The BDA.

17. BLURAY DISC
➔ The format was developed to enable
recording, rewriting and playback of
high-definition video (HD), as well as
storing large amounts of data.
➔ 25GB on a single-layer disc
➔ Blue ray lasers , having shorter
wavelength form stores data with
greater precision and hence, allows
for greater storage.

18. BLU RAY DISCS
ARCHITECTURE
Blue-violet laser.
More precision!

19. Maximum
Data
Possible on
A Disk?
Pioneer has developed a disk with a
capacity of
500 GB data
storage.

20. Security Security Encryption System.

21. FORMATS OF
BDC
BD - ROM (read only for pre -
recorded content)
BD - R(recordable for PC data
storage)
BD-RW( rewritable forPC data
storage)
BD-RE(rewritable or HDTV
recording)

22. TROUBLESHOOTING
DUST
DISK SCRATCHES
FIRMWARE
HARDWARE

23. DUST
Compressed air
Special optical disk cleaner disk

24. Disk Scratches
Visual Inspection
Check in another environment.
Dry cloth, Abrasive(toothpaste)
Motorized disc cleaner.

25. Firmware
Check manufacturer's website for
firmware updates.

26. ADVANTAGES
Storage
Piracy avoided
Backwards compatible
Backed by major corporations
Birefringence
Disc tilt

27. DISADVANTAGES
A bit expensive
Other players will not be compatible

28. THANK YOU