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Forums > CSDb Discussions > Data capacity on a tape
2020-06-24 11:37
crl

Registered: Mar 2020
Posts: 19
Data capacity on a tape

Does anyone know what the storage capacity of a 60 and 90 minute tape is?

I'm thinking bout the maximum capacity, i.e. where a fastloader is used.

A C64 disk could hold 2x171 kb, but when it comes to tapes, we must be into the megabytes.
 
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2020-06-24 13:24
crl

Registered: Mar 2020
Posts: 19
So around 800 kB / 1200 kB depending on the type of tape. That sounds about right.
2020-06-24 13:25
tlr

Registered: Sep 2003
Posts: 1313
Quoting crl
So around 800 kB / 1200 kB depending on the type of tape. That sounds about right.

per side, yes.
2020-06-25 12:58
Golara

Registered: Jan 2018
Posts: 206
Quote: So around 800 kB / 1200 kB depending on the type of tape. That sounds about right.

Which is something you would not be able to load at once. If you instead decide to fill up the tape with lots of 50kb files then the capacity will be bit less, since you need the header for each file.
2020-06-25 13:50
F7sus4

Registered: Apr 2013
Posts: 15
@Golara: The differences those headers would take are often smaller than differences between the same declared tape lengths from various manufacturers.
2020-06-25 13:58
Krill

Registered: Apr 2002
Posts: 1476
Here's an older thread discussing maximising tape storage capacity: Tape loaders using more than two pulse widths for data
2020-06-25 17:52
Burglar

Registered: Dec 2004
Posts: 823
Quoting Golara
Which is something you would not be able to load at once. If you instead decide to fill up the tape with lots of 50kb files then the capacity will be bit less, since you need the header for each file.
so who will code a tape-iffl?
2020-06-25 19:24
Zyron

Registered: Jan 2002
Posts: 2212
You will. ;)
2020-06-25 20:13
Frantic

Registered: Mar 2003
Posts: 1433
Hedning would like it
2020-06-25 22:35
morphfrog

Registered: Mar 2002
Posts: 15
Would be very cool, tape is the future(tm).
2020-06-26 10:24
tlr

Registered: Sep 2003
Posts: 1313
If you want to pack the data densely and want to be able to stop/start dynamically you’ll have to ask the user to rewind slightly here and there.
(Unless you fully implement loading during wind-down/wind-up of the motor)
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