7 8 81 
Table 2 
Storage Capacity and Input Rates for the Schlumberger 42 Track 
ML2601 (without error detection and correction). 
Track Packing Tape Nominal Simulation Range of 
Density Storage Input Reproduction Input 
KBit/s (KPBI) Capacity Data Rate Ability Data Rate 
MBits/M MBit/s* Input Range* MBit/st+t 
MBit/s 
656 16.6 25.3 70 TO 84 45. 10-105 
724 18.4 28.1 77 TO 94 54 TO 118 
815 20.7 31.6 87.70 1053 60 TO 132 
231 23.7 36.1 99 TO. 121 66 TO 154 
1087 27.6 42.1 115 TO 140 9270154 
1304 33.1 50.5 140 TO 154 109 TO 154 
1630 41.4 NOT USED 
The only possible conclusions to date for the acquisition 
and recording of data is the range of 100 Mbit/sec are: 
- recording with high density digital tape recorders does not 
present any problem from a technologival viewpoint 
- recorders with 42 or 28 tracks can be used. 
Parameters to be considered are: 
- density: 28 track recorders have to work at much higher 
density. Error correction devices are recommended in order to 
guarantee the required bit error rate. 
- capacity": 42 track recorders will store a larger amount of 
data. This is influenced anyway by the average and maximum pass 
duration to be recorded, and by the archiving and playback 
approach selected (e.g. one pass per tape, data compression, 
elimination of bad data sets, etc.). 
Table 3 
ERS-1 HDDR Configuration for SAR 
Recorder Speed Tape Used (Ft.) Tapes/Year 
42 Track 120IPS 6000 (10 Mins.) 3650