1、ECMA ECMA*LSb 93 3404593 OOLB200 5TT ECMA EUROPEAN COMPUTER MANUFACTURERS ASSOCIATION STANDARD ECMA-196 DATA INTERCHANGE ON 12,7 mm 36 TRACKS MAGNETIC TAPE CARTRIDGES December 1993 ECMA ECMA*Lqb 93 3404593 0018201 43b Free copies of this document are availrible from ECMA, European Computer Manufactu
2、rers Association, 114 Rue du Rhne - CH-1204 Geneva (Switzerland) Phone: 41 22 735 36 34 Fax: 41 22 786 52 31 X.400. C=ch, A=arcom, P=ecma, O=genevmet, OUl=ecma, S=helpdesk Internet: helpdeskecmach ECMA ECMA*LSb 93 3404593 OOL8202 372 ECMA EUROPEAN COMPUTER MANUFACTURERS ASSOCIATION STANDARD ECMA496
3、DATA INTERCHANGE ON 12,7 mm 36 TRACKS MAGNETIC TAPE CARTRIDGES December 1993 ECMA ECMA+LSb 93 3404593 OOL203 209 Brief history ECMA has produced a series of 14 ECMA Standards for cassettes and cartridges containing magnetic tapes of different widths and characteristics. Among them are the following
4、Standards for 12,7 mm tape. ECMA-120 (1993): ECMA-152 (1993): ECMA- 182 ( 1992): ECMA-197 (1993): This ECMA Standard is related to further developments of cartridges containing 12,7 mm magnetic tape. It incorporates most of the requirements of Standard ECMA-152, together with extensions and modifica
5、tions which specify the additional features that allow higher capacities to be achieved. Two types of cartridge are defined within this Standard. For one of the types, the requirements for the case and the tape are identical with those in Standard ECMA-152. The second type conforms to different requ
6、irements which are defined in this Standard. This Standard also specifies a recording method and format for use with either type. It is not intended that this Standard replaces Standard ECMA-152. Existing cartridges which conform to Standard ECMA- 152 will continue to do so and will not conform to a
7、ll the requirements of this Standard. Drives which Write and read according to this Standard may have the ability to accept and read cartridges conforming to Standard ECMA-120 or ECMA- 152. Daia Interchange on 12.7 mm 18-Track Magnetic Tape Cartridges Data Interchange on 12,7 mm 18-Track Magnetic Ta
8、pe Cartridges - Extended Format Data Interchange on 12,7 mm 48-Track Magnetic Tape Cartridges - DLT 1 Format - Data Interchange on 12,7 mm 112-Track Magnetic Tape Cartridges - DLT 2 Format - Adopted as an ECMA Standard by the General Assembly of December 1993. Section 1 - General ECMA ECMA*Lb 93 340
9、4593 0038204 345 -1- Table of contents Page 1 2 2.1 2.2 2.3 3 4 4.1 4.2 4.3 4.4 4.5 4.6 4.6.1 4.6.2 4.6.3 4.6.4 4.7 4.8 4.9 4.10 4.1 1 4.12 4.13 4.14 4.15 4.16 4.17 4.18 4.19 4.20 4.21 4.22 4.23 4.24 4.25 4.26 4.27 4.28 4.29 4.30 scope Conformance Magnetic tape cartridge Generating system Receiving
10、system References Definitions algorithm algorithmically Processed Data Beginning of Tape (BOT) Cyclic Redundancy Check (CRC) Character Data Records byte Processed Data Record (PDR) Host Data Record Logical Data Record (LDR) User Data Record (UDR) End of Tape (EOT) Error correcting code (ECC) flux tr
11、ansition position flux transition spacing Frame logical backwards logical forwards magnetic tape Master Standard Reference Tape packet Pad byte physical backward physical forward physical recording density Processed Data Secondary Standard Reference Tape Standard Reference Amplitude (SRA) Standard R
12、eference Current Tape Reference Edge Test Recording Current track Typical Field transformation Wrap 5 Conventions and notations i 1 2 2 2 2 2 2 2 2 2 2 2 2 2 2 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 4 4 4 4 4 4 4 4 ECMA ECMA*LSb 93 3404593 0038205 081 - 11 - 5.1 Representation of numbers 5.2 NmeS 5.3 Acronym
13、s 4 4 4 6 Environment and safety 6.1 Cartridge/tape testing environment 6.2 Cartridge operating environment 6.3 Cartridge storage environment 6.4 Safety requirements 6.4.1 Safeness 6.4.2 Flammability 6.5 Transportation Section 2 - Characteristics of the tapes 6 7 Characteristics of the tapes 7.1 7.2
14、 7.3 7.4 7.5 7.6 7.7 7.7.1 7.7.2 7.8 7.9 7.10 7.10.1 7.10.2 7.11 7.12 7.13 7.14 7.15 7.16 7.17 7.18 7.18.1 7.18.2 7.19 7.20 7.20.1 7.20.2 7.20.3 7.20.4 7.20.5 7.21 7.21.1 7.21.2 Material Tape length Tape width Tape discontinuity Total thickness of tape Base material thickness Longitudinal curvat Ure
15、 CST tape ECCST tape Out-of-piane distortions Cupping Dynamic frictional characteristics Frictionai drag between the recording surface and the back surface Frictional drag between the tape recording surface and ferrite after environmental cycling Coating adhesion Flexural rigidity Electrical resista
16、nce of coated surfaces Tape durability Inhibitor tape Tape abrasivity Accelerated life test Data integrity test Requirement Procedure he-recording condition Magnetic recording characteristics Typical field Signai amplitude Resolution overwrite Narrow-band signal-to-noise ratio (NB-SNR) Tape quality
17、Missing pulses Missing pulse zones 6 6 6 6 6 6 6 6 6 7 7 7 7 7 8 8 9 9 10 10 10 10 10 11 11 11 11 11 12 12 12 12 13 13 13 ECMA ECMA*Lb 73 3404593 OOL82Ob TL8 - iii - 7.21.3 Coincident Missing Pulse Zones Section 3 - Cartridge 8 Dimensional and mechanical characteristics of the cartridge 8.1 8.2 8.3
18、8.4 8.5 8.6 8.7 8.8 8.9 8.10 8.1 1 8.12 8.13 Overail dimensions (figure 4) Write-inhibit mechanism (figures 4 and 5) Label area of the rear side (figures 6 and 7) Label area of the top side (figure 6) Case opening (figures $6 and 10) Locating notches (figures 8,9 and 11) Locating areas (figure 8) In
19、side configuration of the case around the case opening (figures 8 and 12) Other external dimensions of the case (figure 9) Central window (figure 8) Stacking ribs (figures 7 and 8) Recessed area (figures 13 and 14) Flexibility of the case 8.13.1 Requirements 8.13.2 Procedure 8.14 Tape reel (figures
20、15 and 16) 8.14.1 Locking mechanism (figure 16) 8.14.2 Axis of rotation of the reel 8.14.3 Metallic insert (figure 15) 8.14.4 Toothed rim (figure 15) 8.14.5 Hub of the reel (figure 15) 8.14.6 Relative positions 8.14.7 Characteristics of the toothed rim (figure 17) 8.15 8.16 8.17 8.18 8.19 8.20 8.21
21、8.22 Leader block (figure 18) Attachment of the tape to the leader block (figure 19) Latching mechanism (figure 20) Tape wind Wind tension Circumference of the tape reel Moment of inertia Cartridge case colours Section 4 - Recording method and formats 9 Method of recording 9.1 Physical recording den
22、sity 9.2 Bit cell length 9.3 Average bit cell length 9.3.1 9.3.2 Long-term average bit cell length Short-term average bit cell length 9.4 9.5 Bit cell peak position 9.6 Bit shift 9.7 Total character skew 9.8 Read signal amplitude 9.9 Coincident Missing Puise Zones Rate of change of the short-term av
23、erage bit cell length i 13 14 14 14 15 15 16 16 16 17 17 17 17 17 18 18 18 18 18 19 19 19 19 19 20 20 21 21 22 22 22 22 22 23 31 31 31 31 31 31 31 31 31 32 32 32 32 ECMA ECflA*Lb 93 = 3404593 0018207 954 = - iv - 10 Track format 10.1 Number of backs 10.2 Track positions 10.3 Track width 10.4 Azimuth
24、 10.5 Track Identification 11 Packet format 11.1 Packets 11.2 Packet ID 11.3 UDR 11.4 Packet Trailer 1 1.4.1 11.4.2 Packet Trailer when data has been processed Packet Trailer when the daa has not been processed 12 Data Block format 12.1 DataPar 12.1.1 Packet bytes 12.1.2 Count field bytes 12.1.3 Blo
25、ck ID bytes 12.2 Allocation of the bytes of the Data Block to Frames 12.2.1 Prefix Frames 12.2.2 Data Frames 12.2.3 Residual Frame 1 12.2.4 Residual Frame 2 12.2.5 Suffix Frames 12.3 Error Correction Code (ECC) 12.4 12.5 Recorded Data Block Recording of 8-bit bytes on the tape 12.5.1 Preamble 12.5.2
26、 12.5.3 Resync Control Frame 12.5.4 12.5.5 Postamble Beginning of Data Mark (BDM) End of Data Mark (EDM) 12.6 Maximum data density 13 Tapeformat 13.1 Zones 13.2 Density ID Mark 13.3 VOLID Mark 13.4 ID Separator Mark 13.5 Interblock Gap 13.6 EraseGap 13.6.1 Normal Erase Gap 13.6.2 Extended Erase Gap
27、13.7 TapeMark 13.8 Wrap Marks 13.9 Mark Merge 13.9.1 IBG followed by a Tape Mark 32 32 32 33 33 33 34 34 35 36 36 36 36 36 36 37 37 37 37 38 38 39 40 42 42 43 43 44 44 44 44 44 45 45 45 45 46 47 47 48 48 48 48 48 49 49 13.9.1 13.9.2 13.9.3 13.9.4 13.9.5 13.9.6 13.9.7 13.9.8 13.9.9 13.10 13.11 ECMA E
28、CMA*LSb 93 3404593 OOL8208 890 -v- IBG followed by a Tape Mark Tape Mark followed by an IBG IBG followed by a Ense Gap Erase Gap followed by an IBG IBG followed by a Wrap Mark Wrap Mark followed by an IBG IBG followed by a VOLID Mark ONE or ZERO VOLID Mark ONE or ZERO followed by an IBG Summary of t
29、he relationship between Interblock Gaps, Erase Gaps, Tape Marks, and Wrap Marks End of Data Block Recording Area 49 50 50 50 50 50 50 50 51 51 52 Annex A - Recommendations for transportation Annex B - Inhibitor cartridge Annex C - Tape abrasivity measurement procedure Annex D - Recommendations on ta
30、pe durability Annex E - Pre-recording condition Annex F - Representation of &bit bytes by 9-bit patterns Annex G - Measurement of bit shift Annex H - Summary of data flow Annex J - Implementation of a CRC Annex K - Calculation of a physical position indicator 55 57 59 63 65 67 71 73 75 77 Annex L -
31、Accelerated life test 79 Annex M - Media Type Label 81 ECMA ECMA*lnlll l, = 0.4 mm 8.14.6.2 Whether the cartridge is in the hand or II the drive (fqures 15 and 16): - the distance from the bottom surface of the metallic insert to plane P shall be l, = 2,27 mm i 0.12 mm the distance of the inside of
32、the lower fiange of the reel to plane P shall be l, = 0,65 mm f 0,09 mm the distance from the tip of the button of the locking mechanism to Reference Surface C shall be l, = 8.1 mm f 0,35 mm the force required to move the button into this position shall not exceed 12,225 N, the distance from the cen
33、treline of the tape to Reference Surface C shall be I, = 12,25 mm nominal the distance from the Reference Surface C to plane P (see 8.14.7) shall be l, = 5.04 mm f 0,25 mm - 8.14.6.3 With the cartridge in the drive (Figure 16): - - - - 8.14.7 Characteristics of the toothed rim (Figure 17) The toothe
34、d rim shall comprise 60 teeth spaced a an angle of 6 O f 5 non-cumulative The teeth are specified at the pitch diameter d, by Z, = 4 mm nominal l, = 2 mm nominal 4 = 30“ nominal The pitch line is the circumference of the teeth taken at the distance 149. The plane in which it lies is the plane P ment
35、ioned above. The blend radius at the bottom of the teeth shall be +O,I nun - 0.0 mm r11=0,2mm ECMA ECflA*Lh 93 W 3404593 OOLB229 515 W -21 - The blend radius at the tip of the teeth shall be r12 = 0.25 mm max. 8.15 Leader block (figure 18) The leader block shaii have the following dimensions. Z, = 3
36、 1.80 mm f 0,04 mm Z, = 6,8 mm I 0,l mm Z52 = 21.8 mm f 0.2 mm + 0.06 mm i, = 10.93 mm - 0,08 mm ij4 = 5.46 mm f 0.10 mm 4, = 6.00 mm f 0.25 mm + 0.0 nmi -0Jnmi i, = 16,5 mm Z5, = 5.2 mm f 0,2 mm 13 = 25,OO mm i 0,25 mm ri4 = 1,4 mm f 0.2 mm 15 = 530 mm f 0,25 rnm d, = 7,O mm f 0,2 mm d, = 4,O mm f
37、0.2 mm pl = 90“ f 2“ + O0 - 3O = 8“ + O“ - 3O CLJ =44“ 8.16 Attachment of the tape to the leader block (fgure 19) There shall be a cylindrical insert for attaching the tape to the leader block. It shall cover the full width of the tape and not protrude beyond the surfaces of the leader block. In zon
38、e Z the bottom edge of the tape (as seen in figure 19) shall be parailel to the edge of the leader block within 0.12 mm and shall be at a distance Z, = 1,90 mm f 0,26 mm from it, when measured while the tape is under tension. When fHed to the leader block the end of the tape shall not protrude above the surface of the leader block by more than i, = 2.50 mm The leader block shall remain attached to the tape when a force of 10 N is applied at an angle p4 = 38“ f 20 as shown in figure 19.
