# Disc number Sequential Action
**URL:** https://community.mp3tag.de/t/disc-number-sequential-action/48946
**Category:** Support
**Created:** [May 14, 2020, 3:10am UTC](https://community.mp3tag.de/t/disc-number-sequential-action/48946 "2020-05-14T03:10:42Z")
**Posts on this page:** 7
**Page:** 1
### Author:  [@Bluesrule](https://community.mp3tag.de/u/Bluesrule)
#### Post date: [May 14, 2020, 3:10am UTC](https://community.mp3tag.de/t/disc-number-sequential-action/48946/1 "2020-05-14T03:10:42Z")
First , I have searched , however if I've missed the answer please point me to it .
Now then ,
I've a folder containing 40 volumes and each volumes has 20 files .
I'd like an action to tag them with the correct discnumbers in sequential order
ie : CD 01 , CD 02 , CD 03 through to CD 40 .
please help .
I
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### Author:  [@Bluesrule](https://community.mp3tag.de/u/Bluesrule)
#### Post date: [May 14, 2020, 3:24am UTC](https://community.mp3tag.de/t/disc-number-sequential-action/48946/2 "2020-05-14T03:24:57Z")
Ok I'm working through this and by using the auto numbering wizard have generated the numerical values , 01 , 02 , etc.
Now I'd like to add the prefix CD ( plus a space )
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### Author:  [@ohrenkino](https://community.mp3tag.de/u/ohrenkino)
#### Post date: [May 14, 2020, 4:20am UTC](https://community.mp3tag.de/t/disc-number-sequential-action/48946/3 "2020-05-14T04:20:25Z")
See the FAQs:
> [@Actions and batch-operations](https://community.mp3tag.de/t/actions-and-batch-operations/967/5):
>
> How to append the string " xyz" to the content of a tag field? Create a [new action](https://community.mp3tag.de/t/actions/967/2) in an existing action group and choose Format value as action type. Field specifies the tag field the formatting rule should be applied to. Format string must have the field placeholder for the field selected above and the string which should be appended. Example: If you want to append the string " xyz" to the current value of the comment field: Action type: Format value Field: COMMENT Format string: %com…
I would like to add that the field DISCNUMBER is a numeric field with exception of the slash.
Adding letters would break that and lead to possible irritations in players. IMHO it is the task of the player to supply a suitable label for a field.
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### Author:  [@Crissov](https://community.mp3tag.de/u/Crissov)
#### Post date: [May 14, 2020, 6:29am UTC](https://community.mp3tag.de/t/disc-number-sequential-action/48946/4 "2020-05-14T06:29:06Z")
If you really want to add disc names (like _Dawn to Dusk_ and _Twilight to Starlight_ for the Smashing Pumpkinsʼ 1995 double-CD album _Mellon Collie and the Infinite Sadness_), `TSST` _set subtitle_ seems like the appropriate field in ID3v2.4 (not available in v2.3), since it “is intended for the subtitle of the part of a set this track belongs to” and _set_ could be a physical disc among other meanings. Mp3tagʼs respective variable name is `SETSUBTITLE` and there is no equivalent predefined box/atom for MP4 tags.
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### Author:  [@Bluesrule](https://community.mp3tag.de/u/Bluesrule)
#### Post date: [May 14, 2020, 6:57am UTC](https://community.mp3tag.de/t/disc-number-sequential-action/48946/5 "2020-05-14T06:57:29Z")
thank-you both .
I'm simply distinguishing between CD's , LP's and the such.
I've tagged numerous files this way manually with no apparent problems for players .
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### Author:  [@ohrenkino](https://community.mp3tag.de/u/ohrenkino)
#### Post date: [May 14, 2020, 7:01am UTC](https://community.mp3tag.de/t/disc-number-sequential-action/48946/6 "2020-05-14T07:01:06Z")
> [@Bluesrule](#):
>
> distinguishing between CD's , LP's
Perhaps a dedicated field like MEDIATYPE would be a good place as it keeps the data structured.
See the help for fields that are supported by MP3tag:
> **[Tag Field Mappings – Mp3tag Documentation](https://docs.mp3tag.de/mapping/)**
>
> Overview of all available tag fields, their names in Mp3tag, and how they are mapped to the internal structures of the different tag formats. Mp3tag is the universal Tag Editor.
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### Author:  [@system](https://community.mp3tag.de/u/system)
#### Post date: [June 13, 2020, 7:01am UTC](https://community.mp3tag.de/t/disc-number-sequential-action/48946/7 "2020-06-13T07:01:11Z")
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