Electo-magnetic storage (magnetic tape disk) exist for over 50 years with excellent performance for sequential work load.
Image if you have a book without index. if something at page no 30 which you are looking for , you have to scan from first page and when you reach at page no 30 then you know about that which stop your search. Similarly electomagnetic take disk is used for sequential access , its not possible to read randomly, meaning that not suitable for random read workload.
Magnetic take is used for secondary nonvolatile memory, persistent memory specially design for low frequent access data which are: backup or archival purpose.
Electro-magnetic storage is well known:
- for existence for over 50 years
- for excellent performance for sequential workload
Key points of magnetic tape drive
- Existing for over 50 years: You know magnetic tape is well known for taking backup of huge amount of data for over 50 yers.
- Excellent performance for sequential work load: excellent performance for sequential workload for taking backup or archival sort of data. not prefferable for random workload.
- storage space & Size: Relatively permanent and holds large quantities of data
- Performance: it is well suited for sequential access of data ( sequential workload). not suitable for random access of data (random workload). if you have to read random workload , it involves multiple fast-forward and rwind operation which is not preferrable. Its not suitable for multiple fast-forward and rewind opration. 1000 times slower than disk
- Speed: excellent speed with sequential workload but not good for random workload. 1000 times slower than disk if you compare with random workload
- Usage: mainly used for backup, archival of dat , you can say storage of infrequently-used data
- Cost: low cost if you compare with HDD or SSD. consequently 1000 times slower than disk
- Common technologies are 4mm, 8mm, 19mm, LTO-2 and SDLT
- the original version of which was released in 2000 and can hold 100 GB of data
- The seventh generation of LTO Ultrium was released in 2015 and can hold 6.0 TB
Your comments are welcome to improve this post about magnetic tape drive. Happy learning