Page 2:Security Approaches
Page 3:Does Emergency Data Recovery Work Properly?
Page 4:The Linear Method Or Helical Scan
Page 5:Data Compression: Optimistic Specifications
Page 7:8 mm / Mammoth / AIT
Page 11:Test Object: Tandberg SLR75
Page 12:Test Scenario: Backing Up 28.4 GB Of Usage Data
Page 13:The Backup Process
Page 14:The Dress Rehearsal: Restoring Data
Page 15:The Future: Minimize Sources Of Error
8 mm / Mammoth / AIT
Magnetic tapes of 8 mm width originally were designed for video. Like DAT, 8 mm also employs Helical scan-based recording, though it offers much greater capacity.
Two formats among the 8 mm tapes are Mammoth - sponsored by ExaByte - and AIT, a solution backed by Sony and Seagate.
|Standard||Capacity||Maximum Transfer Rate|
|8 mm||3.5 GB||533 kB/s|
|8 mm||5 GB||1 MB/s|
|8 mm||7 GB||1 MB/s|
|8 mm||7 GB||2 MB/s|
|AIT-1||35 GB||4 MB/s|
|AIT-2||50 GB||6 MB/s|
|AIT-3||100 GB||12 MB/s|
|S-AIT||500 GB||30 MB/s|
|Mammoth||20 GB||6 MB/s|
|Mammoth 2||60 GB||12 MB/s|
Besides high capacities, the AIT system's key advantage is an additional memory chip on the streamer cassette, called MIC (Memory in Cassette), which contains a sort of table of contents for the magnetic tape. This eliminates many search processes when there is frequent access, and a direct jump to the desired position becomes possible. At the same time, AIT drives do not read sector information on the tape. Instead, they calculate the precise position on the basis of MIC information. This feature can also be used to ensure that the tape designated for each respective case is actually used.
For more information visit www.aittape.com .
SLR - this acronym stands for Scalable Linear Recording - is based on a robust design with few moving parts, thus ensuring a long-term reliability. From a technical standpoint, SLR is based on the QIC standard, and as in ADR (see description below), several heads are used. Prewritten servo tracks allow for a precise positioning of the heads. Also, Tandberg emphasizes the solution's high tolerance in case of temperature swings and changes in ambient humidity.
|Capacity||Maximum Transfer Rate|
|SLR3||1.2 GB||300 kB/s|
|SLR4||2.5 GB||300 kB/s|
|SLR5||4 GB||380 kB/s|
|SLR7||20 GB||3 MB/s|
|SLR50||25 GB||2 MB/s|
|SLR60||30 GB||4 MB/s|
|SLR75||38 GB||4 MB/s|
|SLR100||50 GB||5 MB/s|
|SLR140||70 GB||6 MB/s|
For more information: www.tandberg.com .
- Security Approaches
- Does Emergency Data Recovery Work Properly?
- The Linear Method Or Helical Scan
- Data Compression: Optimistic Specifications
- 8 mm / Mammoth / AIT
- Test Object: Tandberg SLR75
- Test Scenario: Backing Up 28.4 GB Of Usage Data
- The Backup Process
- The Dress Rehearsal: Restoring Data
- The Future: Minimize Sources Of Error