- FUJITSU Server PRIMERGY
- Mission Critical IA Server PRIMEQUEST
- Client Computing Devices
High reliability comes from data redundancy. The LTO Ultrium format uses Error Correcting Code (ECC), generated at two levels (C1 and C2), which is added to the data. The data is then recorded on the tapes. This logical format provides quadruple redundancy of data, making it possible to recover data when reading problems occur. Data recovery is possible when lost data is within one track or 32mm of the tape medium.
The number of tracks is a key determinant of capacity. With this Ultrium 1 tape drive, data is written using 8 heads and each tape is divided into 4 bands. For each band, each head goes forwards and backwards on the tape 6 times, writing 12 tracks (6 in each direction). This means that with 8 heads, 96 tracks are written per data band. And, as there are 4 data bands, 384 tracks can be written in total.
All track list
|Number of data bands||Number of heads||Number of times data is written on each band||Amount of tracks|
|LTO Ultrium1||4||8||6 in each direction (12 times)||384|
|LTO Ultrium2||4||8||8 in each direction (16 times)||512|
|LTO Ultrium3||4||16||6 forward 5 backward||704|
|LTO Ultrium4||4||16||7 in each direction (14 times)||896|
|LTO Ultrium5||4||16||10 in each direction (20 times)||1,280|
|LTO Ultrium6||4||16||17 in each direction (34 times)||2,176|
|LTO Ultrium7||4||32||14 in each direction (28 times)||3,584|
|LTO Ultrium8||4||32||26 in each direction (52 times)||6,656|
To ensure accurate data tracking, technology taken from high-density hard disk drives is used. This system compensates both for tape expansion/contraction and operational vibration. It does this by reading servo information written parallel to the tracks.
Ultrium also provides servo information redundancy by writing the servo information in parallel on both sides of each data track.
Such high-density storage requires high precision engineering. To avoid misreads from even slight deviations in head position resulting from tape drive vibration, the Ultrium drive heads are designed to optimally track the data using smooth moving ceramic bearings.
|Supported Tape Libraries||ETERNUS LT20 S2/LT20
ETERNUS LT40 S2/LT40
ETERNUS LT60 S2/LT60
ETERNUS LT260, LT250
ETERNUS LT270 S2/LT270
Note: Products/features/support content introduced on this page, are subject to change without notice.
Share this page