Slimline SATA Cable: One Connector, Data and Power Together
Quick answer / TL;DR: Short answer: slimline SATA is a 13-pin combined data and power connector used almost exclusively for slim optical drives in laptops and compact desktops. It carries 5 V and 12 V power plus the standard SATA data pairs. It is not compatible with standard 7-pin SATA data or 15-pin SATA power connectors. If you are replacing a slim optical drive with a 2.5 inch SSD caddy, you need a standard SATA connection inside the caddy, not a slimline cable.
Slim against standard: 28 AWG buys density and gives up bend tolerance.Slimline SATA, sometimes called slim SATA or SATA Slim, reduces a standard SATA connection to a single 13-pin connector: seven pins of data and six pins of power in one housing. It exists because a 12.7 mm or 9.5 mm optical drive bay has no room for two separate connectors.
The practical consequence is that slimline and standard SATA are not interchangeable. A standard 7-pin data plug will not fit a slimline receptacle, and a slimline cable will not connect to a 3.5 inch hard disk.
What the 13 Pins Carry
The slimline connector merges the two standard SATA interfaces into one housing. Seven pins carry data in the usual arrangement, and six carry power at 5 V and 12 V with grounds. The 3.3 V rail present on a standard 15-pin connector is omitted, which is consistent with slim drives that do not use it.
| Interface | Data pins | Power pins | Total | Typical device |
|---|
| Standard SATA | 7 | 15, separate connector | 22 | 3.5 inch HDD, 2.5 inch SSD | Slimline SATA | 7 | 6, same housing | 13 | slim optical drive | Micro SATA | 7 | 9 | 16 | 1.8 inch drives | mSATA | card edge | via slot | n/a | older compact SSDs |
The omission of 3.3 V is worth noting because it removes one known compatibility problem. On standard SATA power, a 3.3 V rail can trigger the Power Disable feature on some drives, causing them to spin down. Slimline devices do not see that rail at all.
Where Slimline SATA Appears
The connector exists for one reason: space. It appears wherever a full-height optical drive will not fit, which in practice means laptops and small form factor machines.
- Laptop optical drive bays, 12.7 mm and 9.5 mm heights
- Compact desktops and all-in-one machines
- Industrial panel PCs with a slim media bay
- Some set-top and kiosk designs
Replacing a Slim Optical Drive
The common task is swapping an optical drive for a 2.5 inch SSD caddy. The caddy presents a standard SATA data and power connection internally, and a slimline connector externally so it plugs into the laptop's existing socket.
| Task | What you need | Common mistake |
|---|
| Replace slim drive with SSD caddy | caddy with slimline external connector | buying a standard SATA caddy | Replace slim drive with another drive | slimline drive of the same height | height mismatch, bezel does not fit | Test a slim drive externally | slimline to standard SATA adapter | assuming a passive cable will work | Extend an existing slim connection | slimline extension | exceeding the one metre limit |
The height matters as much as the connector. A 12.7 mm drive in a 9.5 mm bay will not fit, and the bezel alignment differs between the two. Measure the original before ordering.
Real-World Applications
Laptop optical bay to SSD conversion
The caddy handles the mechanical and electrical conversion. Confirm that the caddy's external connector matches the laptop's socket orientation, because some slimline plugs exit straight and some exit at an angle, and the bay may only accept one.
Compact desktop with a slim media bay
Replacement slim drives are available but the range is narrow. If the bay is no longer needed, a caddy is usually a better use of the space than sourcing a drive that will rarely be used.
Industrial panel PC media bay
These often use proprietary mounting around a standard slimline connector. Replace the drive, not the connector, and keep the original cable if it is serviceable, because replacements may not match the mounting geometry.
Where slimline is the wrong choice
Manufacturers rarely publish a dimensioned drawing for these parts, which makes the original cable the most reliable reference. Measure the housing, count the pins and note which way the plug exits before ordering.
Any 2.5 or 3.5 inch drive installation. Those use standard SATA connectors, and a slimline cable cannot supply the current a 3.5 inch drive needs at 12 V, nor does it provide the 15-pin power connector the drive expects.
Related reading: SATA cable selection basics — blogs/news/sata-cable
Related reading: SATA power connectors explained — blogs/news/sata-power-cable
Standards and Verification
Slimline SATA is defined within the SATA specification published by the Serial ATA International Organization, as a reduced connector variant for small form factor devices. It uses the same signalling and protocol as standard SATA, so a slim drive behaves identically to a standard one at the interface level.
Because the connector is uncommon, availability is limited and mislabelled listings are frequent. Check the pin count and the housing dimensions against the original part, and prefer a supplier who publishes a dimensioned drawing rather than only a photograph.
After replacement, verify the drive is detected and that the link negotiated at the expected speed. A slimline connection that is partially seated will often detect the drive but produce errors under load, which is the same failure mode as any marginal SATA cable and is diagnosed the same way.
Keep the original slimline cable when replacing a drive. It is matched to the bay geometry and is harder to replace than the drive itself, and a spare is not something a local shop is likely to stock.
Frequently Asked Questions
Is slimline SATA the same as standard SATA?
No. It is a 13-pin combined connector for data and power, used in slim optical drive bays. It is electrically compatible at the signal level but physically incompatible with 7-pin data and 15-pin power connectors.
Can I connect a 2.5 inch SSD to a slimline port?
Only through a caddy or adapter designed for that bay. The caddy presents standard SATA internally and a slimline connector externally, which is exactly the conversion required.
Does slimline SATA supply 12 V?
Yes, along with 5 V. It omits the 3.3 V rail present on standard 15-pin SATA power, which is not used by slim drives.
Why does my slim drive not fit after replacement?
Height and bezel differ between 12.7 mm and 9.5 mm drives. Measure the original and order the same height, and check the bezel shape against the laptop's front panel.
Is slimline SATA fast enough for an SSD?
The interface carries standard SATA signalling at up to 6 Gb/s, so yes. The limitation is usually the laptop's controller, not the connector.
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